Facebook is the #1 vector of US government's indiscriminate spying on everybody's else's citizens. Google comes a close second, but you don't generally give Google as many personal details as you give to Facebook. At least not by your own free will.
And that's really the problem that France has, everyone uses American services so America can basically create a dossier on everyone. No one uses French services other than French citizens, and perhaps a few other souls.