I had the same problem with FB.

I had a stalker friend who would comment on every single post or picture I put up. Not only that, but she'd start asking all kinds of nosy questions. She also would go through my friend list and friend people she'd met through me, but who she barely knew at all, and she would do the same thing on their FB page - clicking like on all their posts and pictures, commenting on everything, etc. I am sure some of these people have unfriended her by now.
I did not unfriend her, but I did create a separate friend list of people I post stuff to now, and she's not on it. So she doesn't see most of the things I put up on FB anymore. I just feel like she needs to get a life.

I also, felt obligated to like pictures all the time and although I don't mind doing that, I had one relative get mad when she claimed that I hadn't "liked" pictures of her new grandchild. Which I had, she just apparently didn't see my name on there. I have young children myself and I can honestly say I don't really care if anyone clicks like on their photos or not. I don't hold it against people if they don't. This just all seems strange to me. I haven't quit FB yet but maybe I will some day, who knows.

There are also the people who want to push their religion and politics down everyone else's throat!