Worldwide Facebook Revenues By Source, 2009-2013 [CHART]
Paid advertising accounts for the vast majority of Facebook’s total revenue, though its share has been dropping over the past several years. As recently as 2009, advertising accounted for 98% of the company’s intake; this year that percentage is down to 83.9%. Total revenues at Facebook will break the $5 billion mark this year, an increase of 35.9% over 2011. Read the rest at eMarketer.