Don't tell your Twitter-addicted friends, but it might just be a fad. According to new stats from Nielsen Online, about 60 percent of new Twitter users stop using the service after a month. On the plus side, the 40 percent retention rate has increased over time, though MySpace and Facebook both do a better job at user loyalty. Critics contend that Nielsen misses the point, since most of Twitter activity occurs on cell phones, not Twitter.com.
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