I'm trying to switch from G+ to FB and finding Facebook way too obtrusive. And that's annoying and even offending. Why am I getting tons of absolutely irrelevan

I'm trying to switch from G+ to FB and finding Facebook way too obtrusive. And that's annoying and even offending. Why am I getting tons of absolutely irrelevant "friend" suggestions, which mainly consist of unknown sexy girls? That's really cheap manipulation. And those offerings like "mark checkbox to send FB invitation to _all_ contacts in your mail service". Meh...