• CNET, Friday, July 1, 2011 12:02 PM

In other Twitter news, its users are now sending 200 million tweets each day, the company reported this week. "That figure becomes quite impressive when one considers that in January 2009, 2 million tweets were sent per day," CNet writes. A year ago, the daily tweet tally stood at a measly 65 million a day. Meanwhile, looking at the most-popular topics during the first six months of the year, Twitter found that pop singer Rebecca Black was the top topic in pop culture, followed by Britney Spears' album "Femme Fatale," and Charlie Sheen. Swine Flu, Hosni Mubarak, and Easter all ranked as top world-event topics on the site.

However, "Even with its growth, Twitter is still far behind Facebook," CNet points out. According to Facebook's official figures, the site has more than 500 million active users who each month share over 30 billion pieces of content, including links, blog posts, and photo albums. There are even reports, CNet adds, that Facebook has topped 750 million members.

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