Someone made a Facebook Paper clone already

Booklet.

http://www.windowsphone.com/en-us/store/app/booklet-beta/7a0c5ecd-b269-47a6-98df-f46c99b5a0eb

It's OK, there are a few things I don't like about it but it's a reasonable start.

Note: I have nothing to do with this app, I simply found a reference to it and posted it here.