• San Francisco Chronicle, Monday, November 15, 2010 2:02 PM

Former Facebook exec Dave Morin and Napster creator Shawn Fanning unveiled their latest project this weekend. Named Path, it's a service that lets people share photos of important moments, but with no more than 50 of their closest friends and family. "Think of it as a place for the memories along your path through life," Morin wrote in a blog post. "No following, no friending, just sharing with the people who matter most."

As the San Francisco Chronicle notes, the 50 person threshold came from "Dunbar's number," which is based on research from Robin Dunbar, Oxford professor of evolutionary psychology, who suggested "150 is the maximum number of social relationships that the human brain can sustain at any given time." Path is backed by actor Ashton Kutcher; high profile investors like Ron Conway and Tim Draper; Salesforce CEO Mark Benioff; and Dustin Moskovitz -- one of Mark Zuckerberg's Harvard roommates who helped found Facebook.

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