StumbleUpon, a discovery engine, has announced that it has completed a $17 million Series B round of financing. The funding will be used to continue to invest in the company’s core discovery technology, expand to new platforms and grow the employee base.

StumbleUpon has more than doubled its registered user base since its series A to more than 14 million and more than tripled its content recommendations to more than 800 million per month. In addition, the company has surpassed one million installs of its iPhone and Android applications since launching them in August 2010.

StumbleUpon promises to make it even easier for people to find interesting and relevant content on the Web, whether they are on their desktop, mobile device or even TV with the new investment.

The financing includes investments from Accel Partners, August Capital, DAG Ventures, First Round Capital and Sherpalo Ventures. The previous round of funding was led by Accel Partners, August Capital and Sherpalo Ventures.