Mobile Search and Display Advertising Growing Fastest

While it's still too early for most research firms to form reliable estimates for location-based mobile advertising spending, the most relevant figures would be mobile display ad spending, which is expected to increase 59.7% this year, reaching $166 million. By 2013, eMarketer expects mobile display ad spending to reach $546 million.

Overall, the mobile advertising market will reach an estimated $593 million this year, up 42.5% from 2009. By 2013, it's expected to reach $1.5 billion.

eMarketer estimates advertising spending on Facebook will reach $835 million in the US this year, up from $500 million in 2009. Worldwide, Facebook is expected to bring in an estimated $1.28 billion in advertising revenue.