I'm guilty of being a daily Facebook user.
I use it to keep in touch with friends overseas (I travel quite a bit, so I end up with acquaintances spread out everywhere), family, and updates concerning my job. I don't think I could go a day without it.
In addition, Facebook makes for an entertaining source of entertainment, given the fact that the people I have on my list are friends of friends of friends of friends etc...
Stuff that appears on FB makes for an interesting topic around the dinner table or at hangouts, or at the bar.
Kind of like the newspaper, but for more personal, intimate news.