i did the same about 3 weeks ago, Facebook does a great job of showing you how shallow the people around you are. I had a friend that asked me if i wanted to go out that night and the sole purpose was so that she could put the pictures on her account as she hadnt updated it with anything interesting in a while.
The final straw was when i went to lidl to buy a pint of milk and at the top of the receipt it says: "Follow Lidl on Facebook Facebook.com/Lidl" - well that was it - Facebook was an incredibly good tool when it first came out for efficiently talking to a vast number of friends, but i just cant be bothered with it anymore.
I suggested to a friend of mine why not delete her account and she said it would mean she couldnt stalk her friends as easily - so i said, if Facebook is meant to be "social networking" and you're avoiding contacting your friends because your stalking then on Facebook - how is that social?
Anyway, i have decided that if someone is an actual friend, then you can just pick up the phone and call them and ask them what they have been up to - much more social in my view.