Facebook is great because you can just hide their posts and forget they exist. not a big deal.

but even with the other sites, where you would have to remove someone, I'm more ruthless than I used to be. If I don't care about their lives, why would I care about their opinions of me

with g+, I'm a little more liberal about adding people, because they have that built in acquaintances circle, so I just dip anyone I'm undecided on in there.