I'm also a sucker for FB and Twitter, however I don't really post much in either one..I mainly use FB to catch up on long lost friends, who sometimes don't really seem to care if I'm on there one way or another. One of my best friends that moved to FL in 2003 is now married with a son and so she also hangs out with people who have husbands and kids of their own as well and I don't fall into that category sadly. I also catch up on old college friends as well and I like when there is a new post about their status.
As for Twitter, I only use it to find out about my favorite TV shows/actors and what not. I don't post much there either..I just look sometimes to see if there's anything going on with them and love looking at some funny pics of them!