Any way of dealing with it was by just basically shoving it out, locking it out. Speaking candidly about her struggles in the public eye. But first, the nightline 5. Good evening and thank you for joining us. Im rebecca jarvis. Its the disturbing video raising concerns about alarming behavior on the rise. A livestream of of the crash that killed a 14yearold girl. Why a growing number of social media users are sharing unsafe and sometimes criminal activity. Heres abcs matt gutman. Reporter it took just seconds for this Instagram Live stream to go from dangerous to deadly. [ screaming ] the driver shockingly Live Streaming the aftermath. My sister is [ bleep ] dying. Reporter the video sparking interest and disgust nationwide. Out of that tragic car crash in california. We begin with new details on that wreck involving sisters. Maybe even more tragic that it was being live streamed by the person who was behind the wheel. Reporter police say 18yearold adelia sanchez live streamed this ride through Central California while she was heavily intoxicated. Swerving past that black suv, her 14yearold sister and another teen in the car with her. But then the ride turns deadly. [ screaming ] police say the 18yearold sanchez began drifting off route 165. Then she overcorrected. The car tumbling. The three girls inside screaming. Please wake up reporter shockingly with her sister jacqueline lying lifeless she continues to live stream. I [ bleep ] killed my sister. Okay . I know im going to jail for life. Its very disturbing to us because the callous nature of her actions both leading up to this tragedy and in the immediate aftermath. Reporter sanchez has been charged with gross vehicular manslaughter while intoxicated and also driving under the influence. Shes being held on a 300,000 bail. If it is determined that it was at least a contributing factor to the accident that she was on her phone and she was showing this live, she could be charged with something up to manslaughter. That means serious time behind bars. Reporter the passenger who survived the crash, 14yearold manuela seja, speaking out about that horrific incident. I never thought this would happen. Reporter these shocking incidents seemingly on the rise. People Live Streaming dangerous and sometimes illegal behavior on social media. I think as our technology increases were going to see new innovative ways that people do or commit crimes. And here the technology is Live Streaming. I found somebody im going to kill. Im going to kill this th guy right here. Reporter in april a nationwide manhunt for the socalled facebook killer. Im at the point where i snapped. Reporter Steve Stevens believed to be responsible for a random act of coldblooded murder that he streamed on facebook live. How old are you . Oh, man, im reporter taking the life of 74yearold Robert Godwin sr. This man right here was a good man. And i just i hate hes gone. You know what i mean . I dont know what im going to do. Reporter a 48hour desperate search ensued, ending in stevens killing himself. Looks like theres one guy down in the white car. Reporter and just three months earlier four 18yearolds charged with the beating and racial taunting of another teenager with special needs. That video also broadcast on facebook live. Why you do this . Reporter those suspects arrested and now facing hate crimes charges. Theyve pleaded not guilty. When you live stream you literally now have potentially millions of people watching what youre doing. Its attention. I think people are weaponizing it to some extent. Theyre showing shock things to people who dont necessarily expect to see shocking things. That sense that i can shock the world i think is a power that a lot of people crave. Its now easier and easier to do that with Live Streaming. You should have never got in there. Reporter more recently five teens filmed and mocked a 39yearold man as he drowned. Ha, ha, ha. Reporter not a single one of them called 911. His body was found five days later. Many say those watching those horrific acts bear some responsibility also. I tell people every day that if they witness something either on the net or in person they need to contact authorities. I would like people to look at these live stream events just like they were at the event. If they see somebody being assaulted youre either going to step in yourself or immediately get Law Enforcement there to jump in the middle of it. Think about live stream in the same sort of view. Reporter in chicago Authorities Say as many as 40 people watched the alleged gang rape of a 15yearold girl but not a single one of them called the police. Chicago Police SuperintendentEddie Johnson expressing outrage at the lack of action. It just disgusts me that people would look at those videos and not pick up the phone and die 911. Reporter adam moulter, the author of irresistible the rise of Addictive Technology and the business of keeping us hooked says watching online offers a cloak of anonymity. When youre watching Something Like this happening from a computer screen youre probably a long way away from the action. So psychological distance or remoteness is more likely to diminish and dampen helping behavior. Reporter as a result of videos like these social Media Companies are now looking for ways to better monitor the content of their products. Facebook says it will soon have about 7,500 employees reviewing questionable content. Thats about a third of the companys workforce. We need a way for viewers to flag content as inappropriate or unacceptable so we can stop a live stream midway rather than perpetuating it, allowing it to continue for ten minutes past some horrendous act. Reporter social Media Companies may be able to take videos down before they go viral. But they wont be able to put a stop to people themselves posting those videos. This really boils down to discipline, parents having very strict rules about when kids can live stream et cetera. Hard to control. I get all that. But that this really has to start in the home as far as monitoring or controlling or limiting this behavior. I think Live Streaming is causing a lot of fear, especially among parents, because kids are using Live Streaming in ways that arent safe. Tech companies that are savvy will recognize that fear and theyll recognize theres a gap in the market to be filled and i think some of them are already doing it quite successfully. This is your daughter. Reporter verizons product alerts parents when their teenagers are driving too fast. You can tell her to drive more like this was youll get this. Reporter sprint has drive first, which sends calls to voice mail and silences alerts when a drivers going more than 10 miles an hour. Blocks and responds to texts while you drive. Reporter and chevy has developed the teen driver mode that mutes the radio if the front seat drivers arent wearing their seat belts. In Central California tonight sanchez remains in jail. Her sister would have turned 15 on sunday. For nightline im matt gutman in los angeles. Our thanks to matt gutman for that report. Next, digital dating presses pause. Why it took this couple three years to finally meet after swiping right. And later, in a new documentary diana our mother Princes William and harry share personal memories about their mom. After a dvt blood clot. I sure had a lot on my mind. My 30year marriage. My 3month old business. Plus. What if this happened again . I was given warfarin in the hospital, but wondered, was this the best treatment for me . So i made a point to talk to my doctor. 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Remove contacts before using xiidra and wait at least 15 minutes before reinserting. Chat with your eye doctor about xiidra. In this age of digital dating the rules of the game have completely changed. At least for some. Like the tinder couple youre about to meet. Our cameras rolling as they come face to face for the first time. Heres abcs mara chief schiavocampo. Reporter in the age of digital dating its the ultimate story of boy looking for girl and a love that could last happily ever after . Today 15 of americans have tried online dating, but for the great majority is finding love as easy as a swipe . Its all about innovating. You know, there are 600 million single people on smartphones. Reporter and of those 600 million one 20something duo may have engineered the greatest love story of all time. It all started three years ago when josh avsec logged in to tinder, swiped right and found michelle arendas. Everybody has the same exact photo. Their fingers were up. They had the kissy face and theyre in the mirror. Right . Theyre taking it themselves. She had pictures of her friends and her adventures and where she traveled. Reporter mustering up some courage he sent her a message. Hey, michelle. Reporter and then he waited and waited some more until two months later. Hey, sorry, my phone died. Reporter thus began one of the most unusual courtships in online dating, both coming up with more and more creative excuses for their delay. Two months later hey, sorry, i was in the shower. Reporter seven months later . Hi, i really do apologize for just now getting back to you. Ive had a really busy week. Reporter ten months later. Michelle, i dont want you to think im rude. Midterms are coming up and its just been really hard to keep up with it all. President s day had me swamped recently. You know how it gets. Sorry i havent been too quick to respond. I just got over a really serious relationship when i was a sophomore in high school. Reporter but it was when josh posted their tinder exchange on twitter their flirtatious banter went viral. With 100,000 people liking it. I had 750 followers at the time, and i expected my Fraternity Brothers and my family to appreciate it, you know. Yeah. And then in six days i had 20,000 followers. Reporter some even saying the couple, who had not yet met, should get married. People were already talking about the tinder babies and all this big future. Is there a lot of pressure now . Literally pressure from all over the world. Are you ready for the moment . Of course tinder took notice, arranging for the pair to fly to new york to meet for the first time on good morning america. Three, two, one meet [ cheers and applause ] its so good to finally meet you. We just met each other. It was the greatest meeting in the whole world. But in truth you cant know that 5 Million People are going to watch you hug her for the first time and not feel weird. Definitely that is 100 the weirdest way ive ever met someone. Reporter tinder even offered to fly them anywhere in the world for their first date. Thinking bold, they chose hawaii. A long way to go for a tinder date. People make assumptions about sites like tinder, that theyre merely for hooking up and nothing else, that nothing else can really grow and evolve from there. But the truth is it doesnt matter how you come in to something. If you actually find someone that you have a connection and chemistry with, theres no reason that both of you cant want something more. Reporter but thats what the famous hookup app says it needs to do to stay ahead of the competition. It needs to be making more topquality matches. Weve created over 20 billion connections since we started the app. Thats 20 billion connections that have resulted in friendships, marriages, dates. Reporter in a survey they conducted tinder says 80 of their users are actually looking for a longterm relationship. Dr. Jess carbino is tinders inhouse sociologist. She conducted the survey for the site. He we cant independently vouch for their findings. Online daters are 26 more likely to have had a serious longterm relationship than their offline counterparts. These myths that we have about modern dating are real hooey. Tinder right now is probably the easiest way in the world to meet someone new. But now we want to make it the easiest place in the world to actually get to know that person. Reporter which is what they hope works out well for michelle and josh. So is this an example of what happens on tinder . Do people take a while to connect . Im not sure personally of any other experiences maybe that have been as longlasting as ours when it comes to waiting so long to messaging each other. But i do know that so many people that have met through the app and have really found some great relationships along the way, i just think theyve its very cool. In my own family my sister and my soon to be brotherinlaw theyre getting married in november, and they met on tinder. Reporter but for those still look for love on tinder, some top tips for tinder triumph. You cannot wear a hat. You diminish your likelihood of being swiped right on by 12 . Youre obstructing your eyes. Glasses, for exampler going to lead you to be less swiped right on by 15 . And smile. Youre signaling to people youre kind and approachable. And you increase your likelihood of being swiped right on by 14 . The smarter tinder gets the bigger it gets, the larger audiences, the better we get at suggesting the one or two or three people that we think are perfect for you. Reporter tinder started out as a few guys on a couch in a conference room. Now its 200plus people in a whole building on sunset boulevard. So what will tinder look like in another five years . You may be walking down the street and siri or the tinder assistant speaks in your ear and says shawn, theres a girl we think you might be interested in, youre both free tomorrow night, you might want to set up a date. Reporter for josh and michelle theres no excuse to wait three years to meet. Have you been surprised by the attention this has gotten . Absolutely surprised. Yes. Like surprised is not even a big enough word. Its been crazy. Completely shocked by how many people all over the world and even people in my own life that are reaching out to us and sharing their experiences and where theyve seen it and how they heard about us and sharing it with their friends. Its just been so shocking that so many people are so excited about it. What are you looking forward to . Well, i just need my feet in the sand. I need the ocean. And it doesnt matter if we are posted up in a Cardboard Box in maui. If i am in maui i just know were going to have so much fun. 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Finally tonight, as we approach the 20th anniversary of princess dianas death, a glimpse inside her world from some of the people who knew her best. Her sons opening up, sharing revealing new details about their lives together. Heres abcs eva pilgrim. Reporter for the first time Prince William and prince harry s