LinkedIn_logo_initialsMashable: LinkedIn on Thursday announced it has 150 million members in its network, a 20 million increase over November.

The figure was disclosed in a press release the company issued Thursday announcing its fourth quarter and full-year 2011 results.

The company posted revenues of $167.7 million, beating the analysts’ consensus of $160 million for Q4. Adjusted profit was $0.12 cents per share, which beat analysts’ projections of 7 cents a share. LinkedIn’s stock was up more than 5% in after-hours trading.

The Q4 revenue figure was a 105% jump over the same period in 2010. Revenues for full-year 2011 was $522.2 million, a 115% increase over 2010′s $243.1 million. Once again, Hiring Solutions was the company’s largest source of revenues, providing $84.9 million for the quarter. Marketing Solutions, meanwhile, brought in revenues of $49.5 million, while revenues from Premium Subscriptions totaled $33.3 million.

“Q4 once again exceeded our expectations for member engagement and business growth. It was a fitting end to a memorable year in which we reinforced our position as the pre-eminent professional network on the web,” said Jeff Weiner, CEO of LinkedIn. “We believe continued focus on our members and technology infrastructure positions us well for accelerated product innovation in 2012.”