Facebook announced strong Q4 results yesterday:

• 1bn monthly active users across all platforms, a 25% YoY increase
• 680m monthly active users on mobile, a 57% YoY incease
• Mobile DAUs exceeded web DAUs for the first time in Q4 2012
• Revenues of $1.6bn, up 40% since Q4 2011 and slightly ahead of analysts’ expectations
• 84% of revenue from advertising
• 23% of revenue from mobile, up from 14% in Q3 2012
• Non GAAP net income of $416m, up 18% since Q4 2011 (although GAAP net income was much lower)

However, investors were expecting all this good news and Facebook shares were down 4% to $30.51 (VatorNews) in after hours trading, most likely because Zuckerberg spooked investors when he said 2013 will be a year of investment rather than a year of profit maximisation. He highlighted Graph Search and Mobile as two areas for investment.

I, for one, am looking forward to what Graph Search brings us in 2013.