Google is currently doing their earnings call, which you can listen to here. Google is reporting a consolidated revenue of $16.86 billion for the fourth quarter ending on December 31, 2013. That's a 17% increase year-over-year. Traffic Acquisition Costs (TAC) for the fourth quarter totaled $3.31 billion, which is 24% of advertising revenues.
GAAP operating income for Q4 2013 was $3.92 billion, which is equal to 23% of revenues. Comparing to GAAP operating income of $3.39 billion or 24% of revenues in Q4 2012. While Non-GAAP operating income in Q4 2013 was $4.84 billion or 29% of revenues. Compared to the Non-GAAP operating income of $4.27 billion or 30% of revenues in Q4 2012.
Google Sites Revenues accounted for $10.55 billion or 67% of total Google segment revenues in Q4 2013. Which represents a 22% increase year-over-year. Google Network Revenues consists of Google's partner sites which generated $3.52 billion, or 23% of the company's segment revenues in Q4 2013. That's a 3% increase year-over-year. Other Google segment were $1.65 billion, which is 10% of total Google segment revenues. This represents a whopping 99% increase over Q4 2012. For Google's Segment International Revenues, Google totaled $8.77 billion outside of the United States, representing 56% of total Google segment revenues in teh fourth quarter of 2013. That's compared to 56% in Q3 2013, and 54% in Q4 of 2012.
Paid Clicks which include clicks related to ads served on Google sites and the sites our their network members increased about 31% over the fourth quarter of 2012 and increased about 13% over the third quarter of 2013. Cost-per-Click which includes clicks related to ads served on Google sites and their network of sites, decreased about 11% over Q4 2012, and decreased about 2% over Q3 2013.
Now lets talk cash flow. Google's net cash provided by operatin activities in the fourth quarter of 2013 totaled $5.24 billion, compared to $4.67 billion in Q4 2012. In Q4 2013, capital expenditures were $2.26 billion, the majority of which was for production equipment, data-center construction, and real estate purchases. As of December 31st, 2013, cash, cash equivalents and marketable securities totaled $58.72 billion.
As far as the number of employees go, as of December 31st 2013, Google employed 47,756 full-time employees. To break that down further that's 43,862 for Google and 3,894 for Motorola. Compared to 46,421 full-time employees as of September 30, 2013. Which broke down to 42, 162 at Google and 4,259 at Motorola Mobility.