Facebook Ad Revenues Worldwide

“Major marketers are still questioning the effectiveness of advertising on Facebook, and they are concerned that their ability to measure results is underdeveloped,” eMarketer analyst Debra Aho Williamson said in a statement explaining the downgrade. “Facebook is working on addressing these concerns, but it must move even more quickly.” Interestingly, the reduced expectations have nothing to do with mobile advertising, an area where Facebook is seen as lagging behind competitors like Twitter and Google. Businesses never expected mobile to be a significant contributor in 2011.