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A Facebook sign is seen at the main entrance of Facebook's new headquarters in Menlo Park on February 1, 2012 in Calif. - 

Facebook's stock was up on good earnings news yesterday, but another Facebook story from this week caught our eye. It's about the developing world, where Facebook wants to be the Internet portal for mobile users. Those users won't likely have smartphones -- instead flip phones and text messages will connect them to the web.

Jonathan Zittrain, co-founder of Harvard's Berkman Center for Internet & Society, joins Marketplace Tech host Ben Johnson to discuss.