Facebook beats, stock soars

The stock is up more than 6% and climbing on a beat on both the top and bottom line.

Here are the most important numbers:

Revenue: $5.84 billion vs analyst expectations of $5.37 billion

Adjusted EPS: $0.79 vs $0.68 expected

Monthly active users: 1.59 billion, an increase of 21% year-over-year ( vs expectations of 1.58 billion)

Daily active users: 1 .04 billion, an increase of 17% year-over-year (and in line with expectations)

Facebook also reported that 80% of its ad revenue comes from mobile. That's up from 69% at this time last year (and from 78% last quarter), and in line with what analysts were expecting.

More of Facebook's users are using the social network on their smartphones. Mobile MAUs in December hit 1.44 billion (that's up 21% year-over-year) and mobile DAUs hit 934 million (that's up 25% year-over-year).

Here's a look at how Facebook's userbase has grown via BI Intelligence:

Here are the other important numbers:

Costs and expenses of $3.21 billion, which is up 21% year-over-year, with R&D at $1.31 billion.

Capex for Q4 was $692 million.

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