Digital Influence is one of the hottest trends in social media and it is also one of the least understood. Klout, PeerIndex, Kred among many others are investing millions of dollars to understand how our social media activity translates into influence. The market for influence is only heating up with more entrants expected to debut and acquisitions or mergers likely on the horizon. Within the last 90 days alone, Klout took in a Series C of $30 million from Kleiner…