Path: Nervous at Home

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Longtime Facebook employee Dave Morin finally unveiled the story behind Path, the new venture for which he left the company earlier this year. Billing itself as "The Personal Network," Path allows users to share photos shot on their mobile phones only with a select, and real, group of friends. Available for free in the iTunes App store, Path uses email address and phone numbers, not a public database, to enable photo sharing. There's no need to "friend" or follow anyone.

Sharing is limited to no more than 50 people and there are no worries about pictures being viewable by the broader public. According to the Path blog, the 50-person limit was based on the research of Oxford Professor of Evolutionary Psychology Robin Dunbar, which showed that 50 roughly marks "the outer boundary of our personal networks. These are the people we trust, whom we are building trust with, and whom we consider to be the most important and valued people in our lives."