Monitoring everything around you, all the time.
And what you've heard about the UK police is likely to have been comically exaggerated by people with an agenda. There are problems, yes, they do not arrest thousands of people a year for being mean on twitter, no.
(I'm rate limited and can't reply below - when people look into these figures what they tend to find is the majority are people getting arrested for using services like whatsapp or facebook messenger to stalk, harass and threaten others, often in a domestic-violence situation. These are categorised as social media-related but it's not what is often described or assumed by american commentators, that they said something politically sensitive in public, and OH MY GOSH just look at the state of free speech in Britain. It's often much more along the lines of abusers threatening to kill an ex that finally managed to leave them.)