When I joined Facebook, I conceived of it mainly as a way for sharing "personal" stuff:  photos from vacations, funny stories, family news, that kind of thing.  That's one reason I try to only friend people I know "in real life."   But as Facebook has evolved, it is clear that many, perhaps most, of my friends are using it for other purposes:  political venting and discussion, professional self-promotion and networking, and so on.   Facebook has become for a lot of people "their blog."  Now I have a blog for all that stuff, so of course I don't feel inclined to use Facebook that way.  But I'm curious to hear from readers who are also on Facebook how they are using it.   Please choose the option that best fits.