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PeerIndex is a social media analytics company that is building the Influence Graph: who influences whom in which topics across the social platforms. The PeerIndex API provides programmatic access to our data, allowing developers to integrate PeerIndex's Influence Graph into their applications and analytics platforms.
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PeerIndex, which identifies experts who use social media like Twitter to expound on their chosen topics, is effectively building an opinion former marketing service which lets marketers and brands access these highly influential individuals..
So far the PeerIndex API has just one endpoint, so it is pretty easy to integrate.
To make it even easier I wrote a YQL table for the PeerIndex API. You can find a how-to about that here: http://bit.ly/oChnDX