In what was easily the most morbid presentation of our TechCrunch50 conference,we were introduced to a new kind of social network: Footnote , a place for dead people. Of course, the site isn't going to be filled with the interactions of the waking dead. Instead, it's meant as a social memory book, asking users to upload old photos, share stories, and fill in a timeline of their friend or family member's life. You can also tie profiles to each other, detailing how each person knew other members.