I don't think you'll be replacing Apple or Google overnight, Twitter and Facebook only work because of the network effects, a 'facebook or twitter for the UK' would fly just about as good as a lead balloon.
They are also forced upon the population by the state and China speaks a different language than English.
Baidu was there already there to quickly fill the void that google left. Similar things would happen with other companies if major players magically vanished the next day too.
Found the brit !
I don't think I'm following you.
1971genocide thinks you are British!
Not sure whether to take that as a compliment, which is a sad reflection on the state of both the UK and NL.