today declared quarterly consolidated revenues of $14.11 billion for the quarter ended June 30, an increase of 19 percent compared to the second quarter of 2012. Operating income in the second quarter of 2013 was $3.12 billion, or 22 percent of revenue. Operating income in the second quarter of 2012 came in at $3.24 billion, or 27 percent of revenues. Despite producing some growth, the company's acquisition of Motorola continues to drag down results, and Google missed analysts estimates for revenue, growth and opex costs.
Highlights for the quarter include aggregate paid clicks, which include clicks related to ads served on Google sites and the sites network members, increased approximately 23 percent over the second quarter of 2012 and increased approximately four percent over the first quarter of 2013. Average cost-per-click decreased approximately six percent over the second quarter of 2012, and decreased approximately two percent over the first quarter of 2013.
Motorola Mobile revenues were $998 million, or seven percent of consolidated revenues in the second quarter of 2013, compared to $843 million, also seven percent of consolidated revenues in the second quarter of 2012. Operating loss for Motorola Mobile was $342 million, or -34 percent of Motorola Mobile revenues in the second quarter of 2013. The result was even worse than last year, which had an operating loss of $199 million, or -24 percent of Motorola Mobile revenues in the second quarter of 2012.
On a worldwide basis, Google employed 44,777 full-time employees with 40,178 in Google itself and 4,599 in Motorola Mobile as of June 30. This compares to 53,891 full-time employees in March 2013 with 38,739 in Google, 9,982 Motorola Mobile, and 5,170 employees in the now-sold Motorola Home division. The stock dived five percent in after-hours trading on the results.