I'm guessing the Posterous founders do. ;-) I use Tumblr, because it's more social and because the Tumblr community is basically all of the tech community that

I'm guessing the Posterous founders do. ;-) I use Tumblr, because it's more social and because the Tumblr community is basically all of the tech community that isn't on Hacker News, so I get to see both sides.