According to David Martin, Vice President of Primary Research at Nielsen Online, Twitter’s current visitor retention rate, that is the number of visitors that return to Twitter after signing up within one month is about 40%.  Now for some strange reason, Nielsen isn’t reporting how exactly they determined that number.  I’m going to go ahead and guess here, but I bet they calculated that based on visitors returning to the Twitter.com domain, which won’t give them correct results.

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I have decided, after about 4 or so hours of usage, to do a quick critique of the new Tweetie for Mac app.  This is different than a review, in which I would outlined every aspect of the program with criticisms along the way.  In contrast, this post will only list my criticisms of the app.

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