I only go on Facebook if I'm like totally bored, or have the itch to see how many real-life friends I can see logged in there. I get to see and have short chit-chats with old classmates, my former college professors, immigrant relatives, and others more.
But I hardly use it. More like "Hi, this is my FB account. Feel free to leave a message, and I'll answer when I read it." More like my online answering machine ^_^