Facebook announces Facebook Platform for developers to build applications on top of Facebook's social graph.[20][21]
Facebook launches a complete site redesign with options for tabbed redesign, and allows users to opt into it.[28][29] By September 2008, it forces all users to opt-in.[30]
Facebook activates the Facebook like button
Facebook introduces the option to Like individual comments.
Facebook Messenger is launched for Android and IOS.
Facebook login page changes due to Facebook Timeline addition
