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., reports Ad Age

The majority of revenue, 60% or $1.12 billion, was earned from smaller companies in 2010. That’s greater than the $740 million coming from major marketers like Coke, P&G or, says Ad Age. The top two advertisers were AT&T and, while Google was number five.

ReadWriteWeb’s Marshall Kirkpatrick says the 3rd largest advertiser is a mysterious company listed as In reality, it’s spam from Microsoft that surreptitiously installs a toolbar promotion.

“Installing the toolbar includes managing the browser default search settings and setting your homepage to”, says Google’s Matt Cutts.

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