OneRiot, the realtime search engine, has secured $7 million in Series C funding led by Appian Ventures, Commonwealth Capital Ventures, and Spark Capital, the company’s existing venture capital firms.

OneRiot delivers realtime web search results to millions of users, both at OneRiot.com and to 3rd parties who utilize OneRiot’s Search API. The company will use proceeds of this funding to further enhance its core search product and to support its fast-growing partner network.

“This commitment from our existing investors is a big vote of confidence in the realtime search market, OneRiot’s product offering, and our team’s ability to execute,” said Kimbal Musk, OneRiot’s CEO.

OneRiot’s partners include Yahoo and Microsoft, who recently released a version of Internet Explorer bundled with OneRiot realtime search.

OneRiot launched in November 2008. It helps users find the news, stories and videos that are most relevant to people right now. Search results are ordered using OneRiot’s PulseRank algorithm – a PageRank for the realtime web. PulseRank reflects the current social buzz associated with any content on the web.

OneRiot indexes web pages that are shared in realtime by users on social services such as Twitter and Digg. In addition OneRiot manages its own panel of 3 million users who have opted in to share realtime information with the service.