#4 Private Chats made public

A glitch in the security system of Facebook in 2010 made the private chats of the user visible to their friends. The complaint filed by Electronic Privacy Information Center said "Facebook now discloses personal information to third parties that Facebook users previously did not make available. These changes violate user expectations, diminish user privacy, and contradict Facebook's own representations. These business practices are Unfair and Deceptive Trade Practices."

#5 Ad product Beacon caught negative attention

Beacon, a third party site which provided Facebook with ads to be displayed to the users based on the websites they visited raised a lot of hue and cry among the users. The ad product launched in 2007 broadcasted what you purchases to your friends if you don’t care to turn off the feature. Beacon was dismantled in 2009 following a class action lawsuit.

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