Micro-blogging is the practice of sending brief text updates, photos, audio/video clips or links and make these public on a website and/or distributed to a private group of subscribers. These messages can be submitted by text messaging, instant messaging or e-mail.
Many micro-blogs provide short commentary about medical news, medical specialties or a company's products and services.
Twellow.com is currently grabbing publicly available messages from the Twitter.com micro-blogging service. They analyze and categorize each of the users responsible for those messages into the various categories found at Twellow.com.