LinkedIn investors are rejoicing after smashing fourth-quarter earnings, sending the professional network’s stock up about 10 percent in after-hours trading this afternoon.

The company soundly beat Wall Street expectations by posting revenue of $303.6 million and earnings per share of $0.35. Wall Street had been expecting revenue of $280 million and earnings per share of $0.19. That’s an incredible deficit between expectation and reality, shooting the stock up quickly after the earnings were announced.

As of this writing, LinkedIn is trading at $135.87 per share, an increase of 9.5 percent over its closing price today.

LinkedIn also announced today that it passed the 200 million member milestone at the end of 2012, with “approximately 202 million” total members. Cumulative membership is up 39 percent over 2011.

“We continue to add approximately two members per second, and over 64% of LinkedIn members now come from international markets,” the company said in its earnings report.

Check out LinkedIn’s stock performance over the past year in the chart below:

LNKD Chart

LNKD data by YCharts

LinkedIn pen via Flickr