Obama warns U.S. teens of perils of Facebook

President Barack Obama warned American teenagers on Tuesday of the dangers of putting too much personal information on Internet social networking sites, saying it could come back to haunt them in later life. "Well, let me give you some very practical tips. First of all, I want everybody here to be careful about what you post on Facebook, because in the YouTube age, whatever you do, it will be pulled up again later somewhere in your life," the President said. "And when you're young, you make mistakes and you do some stupid stuff. And I've been hearing a lot about young people who -- you know, they're posting stuff on Facebook, and then suddenly they go apply for a job and somebody has done a search." President Obama referred several times to "mistakes" he had made when he was at school but offered no specifics.