> Surely as the operator as a private service, you should have absolute control over what your service is used for?

This fails to acknowledge that Twitter and Facebook are not just private services, they are de-facto global standards of communication, included for governments.

This is great for Twitter and Facebook as long as they keep a neutral stance. When they stop being neutral then governments start to reflect on their power and indeed whether they should be regulated as utilities or ditched (hence e.g. the market's reaction as seen on Twitter's stock price).