I only have a handful of friends on FB, and these are genuine friends that I know, plus family members.
I don't use it much, just don't find it very interesting, none of my friends are avid users either. The occasional thing crops up that is funny/useful, or a photo (usually of dogs or horses!).
The most useful thing for me is being part of a group relating to my main hobby, access to a lot of expertise and help.
Twitter a definite no-no for me!!
You are like me Prussian Red. I too have a handful of real friends on facebook. Some people seem to have thousands of friends. Really? Imagine having to scroll through the crap they post on a daily basis. I just use it for access to certain pages.