Austenbook
Pride and Prejudice told through Facebook.
Soul Compare: Get the most for your soul.
The latest project from Tom Scott is like many Facebook-authenticated apps that ask you to sell your soul, but this one is literal. I think I might offer my soul (worth 56gigaMorgans) to Cthulhu.
Related links
Facebook In Real Life is Today's BIG Thing - APR 30, 2008
This isn't just funny, it also encapsulates a lot of the ridiculousness of Facebook interactions.