Google is still the king of mobile ad sales, with revenue expected to hit $8.85 billion this year, almost double Google’s take last year, according to a new report on worldwide mobile ad revenue from eMarketer Inc. The research firm expects total worldwide mobile ad sales to rise 89% to $16.65 billion from $8.81 billion, with Google accounting for more than half.

But the really fast growth is at Facebook, eMarketer says. It projects mobile ad sales at the social network will grow by more than fivefold this year, to $2.63 billion from $471.34 million in 2012. That will more than triple Facebook’s market share to nearly 16%, eMarketer says.

No one else will even reach a market share in double digits, with Pandora expected to come in third with 2.37%, down from 2.71% in 2012, eMarketer says.

Following are the mobile ad revenue figures by company for 2012, followed by eMarketer’s projected revenue figures and market shares for 2013:
Google, $4.61 billion, $8.85 billion, 53.17%
Facebook, $471.34 million, $2.63 billion, 15.80%
Pandora, $238.75 million, $394.61 million, 2.37%
YP (Yellow Pages), $251.97 million, $377.96 million, 2.27%
Twitter, $138.32 million, $308.03 million, 1.85%
Millennial Media, $72.24 million, $119.88 million, 0.72%
Other, $3.02 billion, $3.97 billion, 23.82%