In Pictures: Facebook turns 10 - A look back at th...
Ads invade the newsfeed
Until January 2012, advertisements on Facebook were discreet, displayed on the side columns of the page where users rarely navigated. Facebook changed that with integrated ads in the News Feed, putting sponsored posts and paid-for ads amid the list displaying other Facebook users' activity.
In Pictures: Facebook turns 10 - A look back at the milestones