How do I find out who are my most active Facebook friends, over time?

Question

I would like to know who are my most active Facebook friends, over time. That is, who among my friends submitted the most stuff (statuses, links, images, etc.) during some significant period of time (say, 3 months).

Answer 1

http://friends.skyttle.com/

Skyttle Friends allows you ... to monitor your Facebook presence, ... get insights into your fans' discussions, behaviour and ... activities

Hope this helps