Social media
Ramesh Srinivasan methodically breaks down five ‘myths’ about social media in this Washington Post article:

Here are his myths (which few in the UX community would flatly believe in, I think):
1. Social media gives power to the people
2. Governments easily monitor and censor social media
3. Facebook and Twitter enabled the Arab Spring
4. Only young people use social media
5. Social media creates a global village