Chris Putnam and his friends created created an XSS-based worm on Facebook and modified infected pages to look just like MySpace profiles. In 2006 Putnam, then 19 years old, received a Facebook note from co-founder Dustin Moskovitz that read something like this (in Putnam’s own words): "Hey, this was funny but it looks like you are deleting contact information from users' profiles when you go to replicate the worm again. That's not so cool."