Article Photos: Facebook tweaks Android phones to build new 'Home' 1/8

FILE- In this Thursday, March 20, photo, Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif. A research firm expects Facebook’s mobile ad revenue to soar this year, hitting nearly $1 billion a year after the company started to splice ads into its users’ mobile phones and tablets. (AP Photo/Jeff Chiu)