MENLO PARK, CA - MAY 18: A 'like' sign stands at the entrance of Facebook headquarters May 18, 2012 in Menlo Park, California. The eight-year-old social network company listed their initial public offering on NASDAQ Friday morning at $38 a share and a valuation of $104 billion, making its IPO the third largest in U.S. history after General Motors and Visa. (Photo by Stephen Lam/Getty Images)
	MENLO PARK, CA - MAY 18: A 'like' sign stands at the entrance of Facebook headquarters May 18, 2012 in Menlo Park, California. The eight-year-old social network company listed their initial public offering on NASDAQ Friday morning at $38 a share and a valuation of $104 billion, making its IPO the third largest in U.S. history after General Motors and Visa. (Photo by Stephen Lam/Getty Images)

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Is Facebook losing its 'cool'?

Daniel Miller of University College London discusses concerns over Facebook's ability to retain teenage users.

Is Facebook losing its 'cool'?

Daniel Miller of University College London discusses concerns over Facebook's ability to retain teenage users.