WTF Facebook

I joined Facebook a year or so ago, because my sister convinced me that I should.  I invited a few people to be friends, from high school and college, and then many more ‘friended’ me.  I accepted many of these, though there is a large pile of requests languishing because I have no idea who they are - no memory of them whatsoever (tip for females: put your maiden name somewhere on your page, so the rest of us can figure out who you are).  I kept up for a bit, I uploaded a profile pic, I commented on a few things, I wrote some statuses (statii?).  But as time goes on, I see less and less value in it.  I don’t really much care that “so-and-so is at the ice cream shop” - why would I want to know this?  And I feel stupid pushing comments on other folks, when I update my status.  I just dont have anything to tell it.  I tend to only look at Facebook now when I get some sort of email alert that someone has ‘written on my wall’, or posted some old embarrassing picture of me, or whatever it is.  Why is this such a “time suck” for people?