Sometime in the last few days my Twitter follower count clicked over a round number of thousands. In parallel, DeWitt Clinton published Sampling Twitter, some nifty research into how many Twitterers are really active. Being, obviously, an egomaniac, I was more interested in how many of the people following me are “active”.
I decided that an interesting first-cut approximation to “active” would be “have posted during the last sixty days”. Based on that metric, assuming my dinky Ruby script is correct, then as of this Monday, of my 4,089 ostensible followers 3,501 are “active”.
Of course, inside Twitter, they could compute real truths; answers to questions like “On average, how many different Twitter timelines in any given week are downloaded that include a post from person X’s feed.” But this is better than nothing; quite indicative actually.