A poll suggests that about a third of people who have joined Twitter no longer use the service, and 7% have shut down their accounts. Those figures, combined with a sluggish user growth rate, suggest that Twitter's user base could level off far below Facebook's total. "Twitter is a great service, it's still got growth in front of it. But in my opinion, I would say the opportunities are less than that of Facebook," said Dan Niles, chief investment officer for AlphaOne Capital Partners.
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