[skolos]

In the early days of odnoklassniki and VKontakte there was a joke in Russia that KGB invented them as better version of its secret files on people. Now it does not look like a joke anymore.

[myth_drannon]

Actually it was originally a serious concern with the Facebook where CIA originally invested through one of its tech funds. KGB is not that smart :)

[beagle3]

I don't think the concern ever went away. And with all the snowden revelations so far, I guess it is reasonable to promote it from concern to near certainty.