Social search startup PeerPong has raised $2.8 million in a funding round from Doll Capital Management, First Round Capital, Charles River Ventures and Partech International, the company tells us. PeerPong says it’s “building a new approach for getting answers from people who know them, building the most comprehensive community and index of expertise on the web.”

Conceptually, it sounds like it could compete with a number of other social search engines including Aardvark, which was recently purchased by Google (NSDQ: GOOG), or even Q&A startup Fluther, which recently raised a round of funding. PeerPong is closed to the public, although visitors to the site can sign up for an invite to a limited beta.