Mark Zuckerberg warned investors three months ago that Facebook’s expenses were going to rise sharply.

The company reported on Wednesday that revenue increased 49 percent in the fourth quarter compared to the previous year, exceeding Wall Street’s expectations. But expenses rose even faster, up 87 percent from the same quarter a year ago, driven in part by a huge increase in stock payouts to employees.

The social network, which makes most of its money by including advertising in the news feeds of its users, said about 69 percent of its advertising revenue came from mobile devices, which have become the most common way people tap into the service. Facebook reported that it had 1.39 billion monthly users worldwide in December, up 3.2 percent from September.

Rupee rebounded sharply after four consecutive sessions of losses

The rupee rebounded sharply after four consecutive sessions of losses as a weakening dollar prompted exporters to sell the US currency while a spurt in buying by foreign investors in domestic debt also helped.

Investors told to put Rs 200 crore intoSpiceJet by year-end

The government has asked troubled SpiceJet's potential investors, led by co-founder Ajay Singh, to put in at least Rs 200 crore into the airline by the year-end. Singh, who had sold his stake to current
Promoter Kalanithi Maran in 2010, is planning to pump in about Rs 1,300 crore along with a couple of global PE funds and re-acquire the airline.