I stayed for so long for that very reason. My usage went down so much, that the only time I logged on was to briefly look at the news feed (of which I hardly recognized anybody anymore. Just posts by peoples' friends of friends).
I decided to just cut it out and hope that I see those people again in real life. If not, then the road goes elsewhere. Feels a little more human.
Yeah, I occasionally go through a lot of post and click "don't see any more stuff from MYCATS" or whatever. But it's gotten to the point where you just can't stop it that way either. I think "like" now means "see more crap from here" otherwise how would so many people be viewing so much junk.
I decided to just cut it out and hope that I see those people again in real life. If not, then the road goes elsewhere. Feels a little more human.