Inhabiting the real world may seem like a mobile, social experience to most people. But for the digitally dependent, riding a crowded bus can be more isolating than sitting in a room alone with a computer.

Now the cellphone screen promises to shatter the loneliness that devotees of social networking sites experience when they walk down a city street or wait in line at the cineplex.

Online social networking heavyweights such as MySpace and Facebook have added mobile features, and start-ups are scrambling to allow people to share every moment, from the sublime to the mundane, with their network of online friends through voice, text, pictures, and video.

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