At it's best YouTube, is a wonderful resource for amusement, education, disseminating information. At its worst, it is like a virus, providing information that is downright false, misleading and just plain bad -- makes me wish there was some form of trash collection on the web. The latest example of the latter are "documentary-type videos capturing the views of parents of autistic children who blame particular vaccines or thimerosal, a mercury-based preservative formerly used in vaccine manufacture, for the autism."
That's one way to undermine evidence-based medicine.
An article written by Helen Branswell, a medical reporter for The Canadian Press, chides public health researchers for not being tech-savvy enough and suggests that they need to get up to speed and try some new strategies, like YouTube for getting their message.
Sounds like a fun grant project to me -- anybody game?