facebook revenue

Facebook (Nasdaq: FB) continues hunting for a major development that'll lure investors back to its stock.

In order to do that, it has to show it can appease both users and advertisers. The world's largest social network, which has amassed some 900 million users worldwide, earned $3.15 billion from advertising in 2011.

But the Menlo Park, CA-based company has to attract more advertisers to its site since they've become disenchanted with Facebook's lagging mobile ad strategy.

Worries that Facebook's ad revenue growth is not moving in tandem with its explosive membership have weighed on the stock. Since going public on May 18 at $38 a share, Facebook stock has slumped 26%.

Recently, the company debuted mobile ads and other services to buoy sales, but investors remain skeptical that the efforts will successfully boost revenue.

"Facebook's been having challenges coming up with effective advertising. The company is hoping to use that inventory on the right side of the page to deliver advertising that is more targeted," Debra Aho Williamson, an analyst at eMarketer Inc., told Bloomberg News.

That's why the company is introducing Facebook Exchange.