Social network Facebook is apparently on a hiring spree; with the company's total workforce in the January-March 2015 quarter having surpassed the 10,000-employee mark. At the end of March 2015, the total number of employees working at Facebook was 10,082. The latest Facebook workforce figures reveal that the company's headcount was increased by a whopping 48 percent in the 2015 first quarter as compared to the same quarter last year.

With the figures underscoring the fact that Facebook is hiring employees at an incredible pace, the company's Chief Financial Officer Dave Wehner said an earning call on Wednesday that Facebook is basically strengthening its workforce in all divisions; with growth specifically skewing towards research and development.

Since Facebook's hiring spree also indicates that the company has increased its spending on hiring, Wehner drew attention to Facebook's expense projections and said that the company is "very pleased with our ability to attract and retain top-tier talent."

Wehner also said that Facebook's high headcount growth during the last one-year period was somewhat "inorganic" because of a number of large acquisitions, including virtual reality goggles startup Oculus, advertising firm LiveRail, and popular instant messaging service WhatsApp. While Oculus had nearly 75 employees, LiveRail and WhatsApp had 170 and 55 employees respectively.