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 senator amy klobuchar they may be more inclined to do something if the law was changed so they would be held liable. >> there is something to create liability. maybe that will make you work fast every so we don't lose another kid. >> reporter: some ask about the social media sites' effects against teenagers including mental health and eating disorders. >> in fact, the algorithms push emotional and provocative content, toxic content that amplifies depression, anger, hate, anxiety because those emotions a atlantic and hook kids and others to their platforms. >> we prohibit content that promotes or glorifies things