Facebook is No. 2 behind Google when it comes to mobile advertisements in the U.S., and it isn't expected to surpass the online search leader any time soon. Google dominates the mobile search market with 93 percent of U.S. mobile search advertising dollars, according to eMarketer. Online music service Pandora Inc. is third in mobile ad dollars, followed by Twitter.
More than half of Facebook's 1.06 billion monthly users access it on a mobile device.
Facebook's event Thursday is at its Menlo Park, Calif., headquarters.
Shares of Facebook rose 83 cents, or 3.3 percent, to close Wednesday at $26.25. The stock is down about 1 percent since the start of the year.