Salesforce.com, Inc. (NYSE:CRM) has acquired social performance company Rypple. Rypple has raised a total of $13 million in funding. The financial details of this acquisition was undisclosed.

Rypple is working on developing new social software for human resources professionals. Rypple is a 2 year old start-up that has raised $7 million in funding from Bridgescale Partners. The company plans to use the new round of funding to expand upon their San Francisco office.