What makes up the Influence score in Followerwonk

[TobiiTech]

New Year, new SEO and social media resolutions... Trying to read up on some to-dos and not to-dos I stumbled across Followerwonk, which I totally love. I do however wonder how the Influence score is calculated. Anyone know?

[TomRayner]

From the horse's mouth:

How is influence calculated?
Influence is an amalgamation of follower count, tweets, age of the account, and influence of followers. This is a proprietary metric of Followerwonk that is much like a Klout score.

http://www.seomoz.org/help/followerwonk 

In addition:

Influence Score

The first metric is Followerwonk's calculation of influence. A high influence score means that the followers engage with the tweets sent by the bookmaker through favorites, replies and retweets.

http://www.bettingexpert.com/blog/do-bookmakers-buy-fake-twitter-followers