Ning, a Silicon Valley start-up, plans to almost double its mobile development staff to 17 to work on a hybrid instant-message and social network it launched in February, said Chief Executive Jason Rosenthal.

WSJ: Mobile App Talent Pool Is Shallow

While Facebook is the number one site U.S. mobile users spend time on line, mobile usage of the social network is even higher in most emerging markets, Facebook Vice President of corporate development Vaughan Smith said at the Global Mobile Internet Conference Silicon Valley in San Jose on Friday.

FORBES: Facebook: Mobile Growth Takes Off in Emerging Markets