Ashton Kutcher has a ton of followers on Twitter, but how influential is he really? For that matter, how influential is anyone on Twitter? Sites like Klout have built small businesses providing educated, imperfect answers to that question, but a definitive influence score may be on its way. Yesterday, former Twitter CEO Evan Williams revealed that Twitter assigns an influence score to every user on the system, data they use to determine who gets a “who you should follow” spot. According to Williams, the company has long debated whether or not to make those scores public, and they could become available sometime in the future.