I do, although rarely. One ex-colleague of mine whom I was connected with at FB left that site and is only available on G+, and in anger I "unfriended" another

I do, although rarely. One ex-colleague of mine whom I was connected with at FB left that site and is only available on G+, and in anger I "unfriended" another ex-colleague on FB whom I'm still connected with on G+, and there is no way I'm going to send a friend request on FB (I've only ever sent a single one myself). That's because I think my anger was justified. Don't send me friend requests if you then basically tell me you don't like what I'm writing. I was not angry enough to sever the connection on G+ too, however. Since I only use FB as a "bookmark service" where I post links to stuff I want to remember myself ("sciency" stuff mostly, zero politics or personal information) it does not really matter much to me. Very few connections on either website (FB or G+) post much that I'm actually interested in, which is pretty limited: Anything posted that's not a science or engineering topic (and nothing superficial from the mass media, please) is just noise. I don't know those people well enough to care about their private lives - when I do care I would not use FB to exchange such news.