Klout, a startup that measures influence on Twitter, has secured $1.5 million in Series A funding from a number of investors, including Allen Morgan of Mayfield Fund, ff Asset Management, Bobby Yazdani, Nova Spivack of Lucid Ventures, Zelkova Ventures, Paige Craig, Tom McInerney, Michael Yavonditte of Quigo Technologies, and Ofer Ronen.

Klout, which recently released a new API, evaluates Twitter users’ behavior with complex ranking algorithms and semantic analysis of content to measure the influence of individuals and topics around the web. Since the company’s launch in 2008, Klout has registered over 250,000 users and over 300 API partners, including CoTweet, HootSuite, and the newly-launched Tweetup, and is handling millions of API calls a day.

The new funding will be used to scale product development and to launch a new web app that is more consumer-focused. With the large number of API partners, it’s clear that the Twitter influence startup is gaining traction, especially in third party Twitter clients. There’s always the risk that Twitter will develop its own measure of authority that can be used, but for now Klout seems to be leading the pack in terms of measuring influence on Twitter.

Crunchbase

• KLOUT

Company: Klout

Website: klout.com

Launch Date: August 2008

Funding: $40M

Klout allows users to track the impact of their opinions, links and recommendations across your social graph. Data is collected about the content users create, how people interact with that content and the size and composition of their networks. Klout identifies influencers and provides tools for influencers to monitor their influence.

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