People still debate whether social media and twitter in particular is a useful business tool for purchasing and finance people. There is still the perception that twitter is all about celebrities and politicians using it as a vehicle for self publicity. Well it is that but it's much more too and as more and more people embrace twitter in their professional lives, it can be difficult to know who is best to follow and why. Now, if you are still skeptical, there's a great paper that will help you out.