If you didn't see this 33 Charts post on why physicians should tweet, blog and use other social media, it's worth a read.
In his post, Texas Children's Hospital pediatrician Bryan Vartabedian, MD, argues in favor of doctors using social media as an effective way to make sound reason, good clinical judgment, and evidence-based thinking part of the Web's information ecosystem:
There are 60,000 members of the American Academy of Pediatrics. Every pediatrician fights vaccine misinformation, especially as they relate to autism. Consider the fact that the first two pages of a Google search for vaccines and autism are polluted with anti-vaccine propaganda driven by a loud, socially-savvy minority. If every AAP member wrote a myth-dispelling post concerning immunization just once a year, Google would be ruled by reason.