Re: "Most Europeans are sharing their data with people outside Europe"
Where it gets trickier for Facebook and indeed Google is data they collect on people who are not users of their services.
I'm referring to Facebook's habbit of tagging people in photos even if they're not Facebook users. Thus they can build up a social network for such people even if they themselves never have any direct contact with Facebook.
I'm also referring to Google using caller ID on Android phones to build up data on who you are and which Android users you call, even if you yourself do not have an Android phone or use Google in any way. Google get to know who you are if you're in the callee's contacts list and can of course Google your phone number.
In collecting data this way Facebook and Google are really skirting on the edges of legality. They have no terms and conditions to point to to say you've signed up, and they're currently exporting such data abroad. Should anyone in Europe choose to sue over being surveilled in this manner, they'd lose almost instantly, especially in the current climate.
Good job for them that there isn't really an equivalent of the American class action system in UK. There is a Information Commissioner who, should they get angry enough, can bare some pretty sharp teeth.