Want people to click your stuff on Twitter? According to Twitter supergenius Dan Zarrella, there’s a science to getting people to click. He knows. He did the research. The biggest surprise for us? Actually, there’s two: First, people actually click those Paper.li links that get posted on Twitter accounts. And second, the best spot to place a link is not at the end of a tweet, but about 25 percent in. Whoa. (ht Poynter)