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Facebook brought in $5.6 billion in ad sales during the fourth quarter of 2015, a 57 percent year-over-year increase, the social network revealed in its earnings report today. Eighty percent of Facebook's quarterly ad revenue, or $4.5 billion, came from mobile, up from 69 percent in 2014.
Facebook's ad revenue for all of 2015 totaled $17.1 billion compared with $11.5 billion the previous year.
The fourth-quarter boost partly came from brands' holiday budgets, which are typically larger than other times of the year. During

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