washington post." lawmakers did not appear to be satisfied with what they claim they've done to stop illegal drug sales. >> we have stepped up and have deployed proactive detection measures to get ahead of what the drug dealers are doing. they are constantly evading our tactics, not just on snapchat but on every platform. >> reporter: with senate amy klobuchar suggesting they may be more inclined to do something where the law would change to hold them liable. >> there's other ways to create liability when something happens so maybe that will make you work faster so we don't lose another kid. >> reporter: illegal drugs are not the only concern. some asked about the social media's effects on teens, including mental health, especially eating disorders. >> the algorithms push emotional and provocative content, toxic content that amplifies depression, anger, hate, anxiety, because those emotions attract and hook kids and others