The guest lecturer on Sunday night was Daniel Kammen, an energy professor at UC Berkeley.

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Matt Symonds is founder of SymondsGSB and a guest lecturer at business schools on inspiring leadership through storytelling.

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I've also taught college classes at Yale University (guest lecturer), LaGuardia Community College and my alma matter Clark University.

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Once again, Paul Tierney , my good friend, legendary private equity and emerging markets investor, and an Adjunct Professor at the Columbia Business School, has invited me to be a guest lecturer at his emerging markets finance course.

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All of that means Facebook users are already in the habit of sharing their personal details and activities with other users on the site by default, and only opting out of the sharing functions for certain actions they want to keep private, says David McClure, an adviser to start-ups and guest lecturer at Stanford who teaches a class on Facebook.

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He has been an invited guest to the White House and Capitol Hill to advise on nanotechnology and emerging technologies, a lecturer at MIT, Harvard, Yale, Cornell, Columbia and NYU, and a frequent guest on CNBC and CNN.

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