Martin points out that both Facebook and MySpace had retention rates around 70 percent when they were emerging sites like Twitter is now, while Twitter languishes below 40 percent.
I think Nielsen could be way off base with this report. Martin didn’t say how Nielsen came to these numbers, but if the evaluators simply determined Twitter’s popularity by measuring visits to Twitter.com from Web browsers, then Nielsen’s numbers are completely inaccurate. The reason is that, unlike other social networks, Twitter’s primary use is not really as a Web site but an Internet-based communications service.
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