Ten, no, Twelve Causalities of Facebook
Mashable lists the first ten, the other two are:
Classmates.com: Why should I pay to keep in touch with my school chums when I can do it for free?
Link Registries: Digg, Reddit, etc. I'm more interested in what my friends find interesting than somebody who I've never heard of.
Classmates.com: Why should I pay to keep in touch with my school chums when I can do it for free?
Link Registries: Digg, Reddit, etc. I'm more interested in what my friends find interesting than somebody who I've never heard of.