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A lot of fuss has already been made about people watching TV on their cell phones and downloading music over the mobile Net, but there's another application that could also generate significant 3G data usage--social networking.

"Carriers have invested a lot of money in their networks," said Charles Golvin, an analyst with Forrester Research. "And at this point it's a lot like throwing spaghetti on the wall to see which applications will stick. I doubt there will be any single killer application, but social networking on mobile phones could certainly be one that generates usage."

Within the last year social networking and community Web sites on the fixed-line Internet have really taken off, especially among teens and twentysomethings, who spend hours online creating profiles and sharing photos, videos and blogs.

MySpace, the most popular of the social networking sites, has more than 67 million members, and it adds roughly 250,000 members every day. MySpace is ranked as the second-most visited Web site on the Internet in terms of unique users, after Yahoo, according to ComScore Media Metrix. Last year Rupert Murdoch's News Corp. bought the company for $580 million.

Though MySpace may be among the most famous of these sites, it's certainly not the only one on the Net. There are dozens of them, including Facebook.com, which is geared toward college students. There are also photo-sharing sites, such as Flickr, that have created popular online communities.

In the past, people using these services could access them only from their desktops or laptops. But now social networking is going mobile, allowing people to use their cell phones to upload pictures or send updates to blogs.

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Mobile communities could fill 3G pipes | CNET News.com