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>> dana: facebook data scandal just got more massive. mark zuckerberg upping the estimate of effective users from 50 million to 87 million. zuckerberg, who is scheduled to testify before congress next week, is taking some blame. >> everyone has a setting on facebook that controls. it's right in your privacy settings. whether or not people can look you up by your contact information. over the period of time that this feature has been around, people have been able to scrape public information. it is reasonable to expect that if you had that setting turned on, that at some point in the last sever...

Starting monday, if you're a facebook user, you'll find out if you are among the 87 million people whose personal data may have been improperly shared with cambridge analytica. anna shekter is with me as well, nbc news producer, a big thanks to all of you. anna, i know you were on this call yesterday with mark zuckerberg. this is one of the things he said i find found interesting. take a listen. >> i think the thing that people should assume, i mean, just given this is a feature that's been available for a while, a lot of people use it for the right way, but there is also -- we've seen some sc...

-- also turned it off. if you have someone's phone number, you can put it in and get, you know, a link to their profile, which pulls up public information. i certainly think that that -- it is reasonable to expect that if you had that setting turned on, that at some point in the last several years, um, someone has probably accessed your public information. >> here's what i want to happen. i want someone to ask mark zuckerberg, does he have that setting on? does sheryl shorthaandberg have setting on? he paused and said, well, most people have that on. if it is a risk, if people don't understand...

Has changed to its complicated. >> i don't think there's been any meaningful impact but it's not good. i don't want anyone to be unsatisfied with our services. >> reporter: and using an e-mail address or phone number -- if you had that setting turned on, at some point in the last several years, somebody has accessed your public information in this way. >> reporter: mark zuckerberg also telling reporters on the conference call that it should take 3 to 6 years to fix it. >> when facebook talks about all of us, people having their information scraped. what does that mean? >> a scrub means taking ...

If you're worried about what facebook knows about you, check out google. nbc news senior business reporter ben popkin wrote that. he joins me. thanks for being here. >> thanks for having me. >> so tell me what the headline is from your report and what people need to know about google. frankly, we all go to google a lot of tile times every day. what do we need to know? >> google collects data on you and a lot of it. but you can check out and see some of what they know about you by going to my account.google.com. it's a website that's been up for years but most users don't know about it. you can...