Lance Armstrong loves it. Oprah’s all over it. Ashton Kutcher found a million people to follow him on it. Heck, Barack Obama used it to get elected president. So why is Twitter in trouble?
According to David Martin, Vice President of Primary Research at Internet traffic monitor Nielsen Online, the site suffers from a retention problem. From month to month, Nielsen data says, just 40 percent of Twitter’s users return to it.
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