2004
February: Mark Zuckerberg and co-founders Dustin Moskovitz, Chris Hughes and Eduardo Saverin launch Facebook from their Harvard dorm room
June: Facebook moves its base of operations to Palo Alto, California.
September: Groups application & the Wall is added as a Profile feature
December: Facebook reaches nearly 1 million users
May: Facebook grows to support more than 800 college networks
August: The company officially changes its name to Facebook from TheFacebook.com
October: Photos is added as an application
December: Facebook reaches more than 5.5 million active users
2006
April: Facebook Mobile feature launchesAugust: Facebook development platform launches; Notes application is introduced; Facebook and Microsoft form strategic relationship for banner ad syndication
September: News Feed and Mini-Feed are introduced with additional privacy controls; Facebook expands registration so anyone can join
November: Share feature added on Facebook, simultaneously launched on over 20 partner sites
December: Facebook reaches more than 12 million active users
2007
February: Virtual gift shop launches as a featureMay: Facebook launches Marketplace application for classified listings
October: Facebook reaches over 50 million active users
November: Facebook launches Facebook Ads
2008
February: Facebook launches in Spanish and FrenchMarch: Facebook updates privacy controls to include Friend List privacy
April: Facebook launches Facebook Chat
August: Facebook reaches over 100 million active users
2009
February: Facebook introduces “Like” featureJune: Facebook launches Facebook Usernames
October: Facebook changes it Privacy Policy
December: Facebook reaches over 350 million active users
2010
April: Open Graph API launches.July: Facebook reaches 500 million users.
August: Facebook Places launches, privacy concerns grow.
October: The Social Network debuts.
December: Time magazine names Mark Zuckerberg “Person of the Year.”