Social-Networking Sites Open Up

Facebook, Friendster, and others are starting to let third-party developers build new features to attract more usersand profits

Dom Tolli envisions a day when people will be able to push a few buttons on their cell phone and post a list of their favorite ringtones on their social-network profiles. As vice-president of value added services for Virgin Mobile USA, Tolli wants Virgin's 4.6 million customers to be able to do more than passively surf their favorite social-networking site. He even has a team of developers standing ready to build the necessary program—they just can't get access to the software to make that happen.

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