New Delhi: Emerging markets like India are a "key source" of growth for Facebook, with increasing number of users logging onto the site through handsets, driving up its advertising revenues 76 percent to $2.34 billion during the December quarter.

Of this, mobile advertising revenue represented about 53 percent, growing from around 23 percent a year-ago.

"In all regions, an increasing number of our Daily Active Users (DAUs) are accessing Facebook through mobile devices, with users in Brazil, U.S. and India representing key sources of mobile growth on average during December 2013 as compared to the same period during 2012," Facebook said.

Also, Monthly Active Users (MAUs) in India stood at 93 million at the end of December 2013, of which 75 million logged in through their mobile phones.

Globally, Facebook - which turns 10 today - reported 1.23 billion MAUs, up 16 percent year-on-year, and 945 million mobile MAUs, up 39 percent from the year-ago period.

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