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Nielsen compares this data to the demographics of Predicto, which is the largest paid mobile community (Twitter is the largest free mobile community), and it turns out that it's quite different. Predicto has a very different male/female user ratio - 45/55, and 68 percent of users are in the 35+ age group.
What does it mean to be the largest free mobile community? It means 812,000 unique SMS users; a relatively large portion of Twitter's monthly 14 million visitors.
As far as earnings go, 16 percent of Twitter users earn $100K+, compared to 20 percent for Predicto. These stats will sure come in handy once - if - Twitter starts monetizing the service.
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