
Follow Cost measures how much people tweet. We use an absolute scale (average number of tweets per day) but also measure tweets in milliscobles, or 1/1000th of Robert Scoble’s Twitter output
An example is shown below,

Simply Measured provides a complete solution for tracking and measuring performance on any Twitter Account. Put your Twitter reporting on...
Sometimes, 140 characters just isn't enough. TweetPlus uses Twitter and Google AJAX Feed APIs to find the blogs your friends...