Governments want control over Youtube, Facebook etc. in order to prevent these kinds of uprisings.
People weren't rioting over access to Youtube and Facebook, but access to them did fuel the riots and help coordinate them (hence they were shut down).
Wait - are you saying that things like the "Arab Spring" were actually protests over access to Youtube and Facebook.
That's... umm.... a bold, unconventional view.
(While many credit Facebook & Twitter with a role in helping to co-ordinate protests I am unaware of any claims that the protests were over access)