Their bat, their ball, their ballpark - therefore their rules.
Don't [like/want/need] it?
Don't play. Go elsewhere.
I don’t! Personally I don’t have the time for either (FB or G+), so while I do have accounts for both I don’t monitor them.
My wife had to tell me about my "wall" filling up with "likes" for Islamic pages all over the damn thing. I went a little ballistic at first - until I discovered that you can't really contact Facebook to complain about such activity. Thought maybe I'd been hacked but it's an email address that was created for Facebook and has never been used for anything else - just logging into Facebook. I can see all activity for that address and there was none at all, except for my Facebook logins of course. Plus I was able to see where - and from what IP address - all logins had been submitted and they were all really me.
Finally I found out that a lot of people suffer the same problem. It seems that there are services that sell "likes". E.g., you have a business and (for some stupid reason!) you want thousands of "likes" for your FB page. You purchase the likes from a service and they immediately generate however many you paid for. I guess they have found a way to associate "likes" with people's accounts without logging in and without any contact with the account holders. Nice, Facebook, really nice.
Anyway I just abandoned the damn account. I don’t visit it, don’t login. I don’t "play" there anymore. Can't be bothered with deleting it. I don’t really care - nothing else of mine is associated with it.