You have heard of “influencers”, people whose endorsement makes a product’s sales jump. The most familiar influencer, we suppose, is Oprah Winfrey. Whenever she likes a product and tells her fans about it, sales are assured. But there are other, lesser known influencers, who can also make a difference a product’s success. Many bloggers on WordPress and on YouTube – video blogs, of course –, and other social media sites have developed long lists of followers. When they mention a product, their followers pay attention. These new social media influencers often promote... [...]