no, they are no 'literally' shadow governments but they are behaving as if large government departments. currently, they are commercial enterprises, and if their user base decided to fuck them off overnight as happened to myspace (well, took about 18 months,) then they would have no power and no influence.

doesn't matter, because whatever people flock to after that will also be corrupted soon enough.

without the internet, they cannot have worldwide tyranny. get off the internet.