I have always been concerned with the approach taken by social network solution to use a centralized information management and storage system. Alternatives exist and I have been working on an architecture for over 14 years that that might take down the current model whilst allowing people to maintain their beloved social network activities.
This time the tipping-point came for me from an article that I read about a Dell Tycoon who spends $2.7million on security when his daughter offers their privacy away on Twitter. The drop of water short-circuiting mainframe. Furthermore, household insurance companies are now starting to include disclaimers when to "social network" your whereabouts. These are the precursors of today's social networks' architecture downfall.
I have canceled my Facebook account 3 times, and this one is for good until content, privacy and security are within the control of the user and not the custodian of everyones' everything.