Facebook - Should I? Do I have to?

For a couple of weeks now I am quite successful in NOT opening a facebook account/page/whatever they call it.

I first thought that Steve Gillmor (of the former Gillmor Gang, now just The Gang) might force me to, but I found the podcast outside facebook.

So it is still open again: Should I join facebook ?
(I'm not really interested in one more social network, but I'd be interested in the applicatoins/service platform it constitutes).