One reason could simply be the fickle nature of the social networking market, suggests Simon Haighton-Williams, technical director of web consultancy WTG in London.

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Florence Toffa, director of Mobile Web Ghana, welcomes the launch of Hope City.

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Chris Pitt moderated a panel on results-based education with Eric Nadelstern of Columbia University, Maureen Devlin, a classroom teacher in Wayland Public Schools, and Steve Hargadon, director of the Web 2.0 Labs.

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