A simple facebook app

I would like to create a simple facebook app that will allow me to rank my top friends. This will work in this way: The program will look on a daily basis of how many people have: 1) posted on my wall 2) commented on my photos 3) commented on my comments. Then it will rank them by: day week year That is all the app will do. This will need to have a perl backend and a php front end. The reasoning behind the perl back-end is that if this is used by a lot of people I don't want to put a lot of strain on the php server and I think that a lot of the checking of the DB could be done with perl in order to take a load off of the php server. That's it. Pretty simple.