Last week, I found this picture of a group dinner at Guero’s restaurant in Austin, TX, taken during South by Southwest in 2002. At the time, most of us at the table knew each other primarily through the web and through the then-nascent blogging...

This one’s been kicking around in my head for a while, and maybe you can all help me understand it. With any contemporary social networking site, I can control who has access to the things I share, and I can update or change or revoke the...