bakedjake - 8:08 pm on Oct 6, 2008 (gmt 0)

Here's another one:

CNN's iReport website hosted a user-submitted story that claimed falsely that Steve Jobs had suffered a heart attack. The prank puts citizen journalism in the line of fire.

[pcworld.com...]

This one had direct economic consequences. Not to say the Wikipedia one didn't.

Unchecked, user generated content is fast coming under fire. Have you ever been negatively affected by it? If so, what have you done?