Facebook posted a 40-percent rise in fourth-quarter earnings Wednesday as the social networking giant brought in $1.585 billion.
But earnings plummeted to 64 million dollars in the quarter,
compared to $302 million a year earlier, triggering a
5-per-cent slide in Facebook's shares in after-hours trading.
Facebook said it had 1.06 billion active monthly users during the quarter and 618 million daily active users.
Facebook said costs rose 82 per cent to $1.06 billion as it spent heavily to boost its mobile offerings.
"In 2012, we connected over a billion people and became a mobile company," said Mark Zuckerberg, Facebook founder and chief executive.
"We enter 2013 with good momentum and will continue to invest to achieve our mission and become a stronger, more valuable company."
