http://www.lockergnome.com/social/2012/02/07/how-to-find-key-influencers/ - Most traditional marketing teams know that promoting a product or generating buzz about a business requires more than just advertising. Marketing teams know they must attract the dedicated attention of key clients, customers, and fans who can spread positive awareness about their products. Some companies call these people evangelists, but many social media marketing teams refer to these consumers as "influencers." Often, influencers have a strong following on Twitter, thousands of Facebook friends and fans, and also often have a blog with a large readership. As a social media manager, knowing how to find key influencers is critical in helping generate awareness for specific social media campaigns for an established company, or even to build buzz about a new business.
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