Image via Wikipedia While Twitter is still gaining traction with most folks, a recent study tell us: "The average (median) lifetime number of tweets for a single user is 1, while 10% of the users contribute 90% of the traffic." Perhaps not a great sign of longevity? One tool I've started to use to cull my numbers so I don't appear to be OVERfollowing is Twitter Karma. Head here to check it out: http://dossy.org/twitter/karma/ I'm not going to review it per se because these fine folk have done that for me: http://oneforty.com/item/twitter-karma http://www.dragonblogger.com/twitter-karma-twitter-sites/ http://www.alonmargovskiy.com/2010/04/twitter-app-review-twitter-karma-review.html However, I will lodge a complaint- not all activity is current. I was looking to lower my follower numbers and it indicated that someone had not tweeted in over a year. Yet, go to their account and it was updated hours ago. Otherwise, it is a good way to visualize what is going on wi...