>any conversations that are snooped on are ones you allow to be snooped on by using a free service

I don't think the innocence of the people who don't know the difference between proprietary and free software should be the thing we attack here, specially since the company in question has gone through great efforts before to restrain the spread of the FSF.

That's debatable. Any company that analyses large amounts of data produced by you in the form of posts, likes/dislikes, follows etc are effectively reading your mind.