By 
2004: Mark Zuckerberg launched Facebook in his Harvard dorm room
2006: Facebook allows anyone over 13 to join, introduces the facebook news feed
2007: Sells a 1.6% stake to Microsoft for $240m
2008: Reaches 100 million users
2009: Introduces “like” button
2010: Facebook becomes profitable
2012: Acquires Instagram for $1bn in cash and stock
2012: Reaches one billion users2014Buys messaging app WhatsApp for $19bn
2015: Extends internet.org effort to provide internet access to rest of world
2016: Facebook becomes the most popular social networking site in the world
