According to an estimate from eMarketer, Facebook took in $1.86 billion in worldwide advertising revenue for 2010, an 86% increase over the company's estimated 2009 advertising revenue of $740 million worldwide. Not surprisingly, the majority of that, $1.21 billion, was earned inside the U.S.
That would give Facebook a 4.7% share of the estimated $25.8 billion total spent in the U.S. on online advertising last year.
Meanwhile, Facebook's worldwide advertising revenues are expected to reach $5.74 billion by 2012. As a (sad) point of comparison, eMarketer estimates that MySpace's worldwide ad revenues will decline from a high of $470 million in 2009 to $156 million in 2012.
Below is a table from AdAge showing the estimates for Facebook's U.S. advertising revenues compared to total U.S. online ad spending:
[tags]adage,social media,social networking[/tags]