I came across a Facebook app today that seems like a reasonable starting point for what we could do with a letter writing application.
The application is called "Causes," and it allows users to create a cause they're interested in (Darfur or the death penalty, for example) to their Facebook as sort of a "cause group." Other Facebookers can then join the "cause group" they're interested in to support it. Think of it like an online petition that you join rather than sign.
If we could modify the application to include names of congressmen, commissioners or newspapers to write in to (in accordance to the user's geographical Facebook location, or wherever) as well as include a text box, you could then write a letter to somebody and let your friends be a part of it. It could spur some interest among your friends who then might join the cause and write in their own personalized letter.
It takes the "causes" and puts them in action. And what better way to send a letter to a congressman than to include your facebook picture? Ooh, ahh, personable traits, behold! Maybe I'll send my avatar instead.
-BLJ Beerbaum