Wow, this is exactly what I thought about my Facebook stream. Too much garbage that I cannot easily filter out, like I can e-mail.
For sending quick notes to my mom, or even my coworkers, maybe. But what about using e-mail as an identity when signing up somewhere? What about creating throwaway accounts? (e.g., sendmespam@lishin.org) What about creating accounts for my business to contact customers? (e.g., donotreply@cannedgoat.com)