Doppelganger Week is the week when Facebook users are supposed to change their profile picture to a famous person they resemble. Doppelganger Week is the first week of February, and the first Doppelganger Week was in 2010.
Facebook is an online social networking service. Facebook debuted on Feb. 4, 2004, and was founded by Mark Zuckerberg, Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes. Facebook is headquartered in Menlo Park, Calif., and had a revenue of $7.8 billion in 2013. Facebook had an estimated monthly usage by 1.28 billion people as of March 2014. Facebook does not cost anything to join, and people may join from anywhere in the world as long as they claim to be at least 13 years old.