I've never used twitter. Facebook if you isolate yourself from all the bullshit and hate surrounding you, can be fun and useful. I have a page that I seldom post anything on, but its fun being nosy checking out others.
I also still use a flip-phone. I have no desire to use the internet outside my door, so I don't have it. If I found a sudden need, I'd bum a few minutes off someone else. I never have so far. I don't text either. If you have my number call me, I'd rather hear you than read you.