At first I uploaded old pictures to my personal albums out of pure vanity. It's common practice on Facebook to upload old pictures of yourself posing with old friends who you dutifully tag and share. Common sense dictates that you look really good in the photo- preferably better than your dear old friends.
Before Facebook, the only place we had this much control over our public image was on the obituary page in the local newspaper.
An obituary is your last chance to show off- to brag a little about your accomplishments, your children, your fabulous career or table top-hockey skills and most importantly, leave a final image in the reader's mind (I'm leaning toward this action photo taken about thirty years ago.)
And thanks to Facebook we not only get to float out trial balloons, we get a preview of what the mourners will say in the comment section!