I wonder if anyone would be brave enough to test this, i.e. use TLS 1.2/forward security to one of sites mentioned, send a message to a "friend" (dumby account) that says you are planning an attack, and see what happens (i.e. it's only viewable by facebook/google whatever, not in transit)
I suggested that on a forum 10 years ago (though about unencrypted emails) to see if the spooks were really monitoring email, and no one seems to want to take up that offer.
