Facebook is my link to my children, and I would be so lost without it. It is an easy way for me to keep in touch with my family, and yet not be intrusive.
I keep my friend list down to people that I actually know, at least for the most part, and if I find someone that is posting stuff I don't want to read or see on my page, then I keep them as friends, but don't allow any of their posts. That way, I can check their page if I want to see how they are doing, and not have to be cluttered with all the games they are playing, or whatever is objectionable.
When someone sends me a game request, I block that game, then no one else can send it to me.
One of the things that I like, is I can subscribe to pages that I am interested in, like homesteading, or weather info, and things like that.
I think that , used properly, Facebook can be a great online communication system.