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"Facebook's ad sales revenue will increase $2 billion year-over-year, totaling $5.1 billion for 2012, according to a new eMarketer  forecast. However, the researcher predicts Google will overtake Facebook in display ad sales by 2013.\nMenlo Park, CA-based Facebook will still dominate this year, raking in $2.6 billion to Google's $2.5 billion in display ad revenues. Yet by end of next year, the Mountain View, CA-based web and technology giant will hold a $3.7 billion to $3.3 billion lead over Facebook for display ads, eMarketer says.\nFacebook's recent S-1 filing revealed that eMarketer was $600 million off its earlier estimates for Facebook's 2011 ad sales ($3.2 billion). In its September 2011\u00A0calculation, the researcher said Facebook would draw $3.8 billion.\nIn an email to ClickZ, eMarketer said the discrepancy between its prediction and Facebook's actual ad revenue was due to the latter's \"disappointing\" Q4 sales.\nAccording to eMarketer, the top three portals trail both Google and Facebook in ad revenue. Yahoo ($1.4 billion), Microsoft ($700 million), and AOL ($600 million) will finish 2012 behind the leaders in that order. The trio remains in the same positions next year, according to eMarketer, but will see incremental lifts in display ad revenues.\nFor total revenue, eMarketer predicts Facebook will pull in $6.1 billion during 2012. Of that sum, $1 billion will come from Facebook Credits and other revenue streams this year, the researcher says.\nNew York-based eMarketer doesn't orchestrate primary research, instead balancing numbers from various other sources to arrive at its forecasts. Its website explains the company's methodology:\neMarketer develops its own market estimates and projections through a careful process of aggregation, normalization, weighting, evaluating and estimating. By leveraging the best market research available, we find the \"best fit\" with that information and make sense of the disparate numbers.\nImage courtesy of iStockphoto, -Oxford-"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/02/23/facebook-2012-ad-sales/>