>Government is... far more insulated from the people than is Facebook

Is it? Facebook doesn't hold elections. It seems entirely unaccountable to me, with no system of checks and balances to reign it in.

>facebook could collapse overnight if enough people decided to stop using it. I don't think a population could exert that level of influence over a government

They could and do, all the time. See: any successful rebellion ever. See also: the collapse of the Soviet Union.