A report by Jupiter Research in 2007 showed that 20% of Americans turn to others online for information about medical issues. They are clearly not shy of seeking or giving advice, even on more personal issues. They use sites such as OrganizedWisdom, a Wiki-style community, to share information they have and get information they need.
The concern over the accuracy of this information still stands, with worries about non-medical professionals sharing information that people use to self-diagnose. But research by the British Medical Journal in 2004 found that in the online support communities it studied only 6% of content was incorrect. If this replicated across all medical content online then it would probably be among some of the more accurate user-generated content on the internet.
User-generated medical content shows that people are willing to share and are accurate when they do so. Even in a more niche and potentially risky area such as medical advice and disgnosis, the quality and usefulness of user-generated content is high.