PIP_Online_Health_2006.pdf (application/pdf Object)
It tells us that 80% of internet users search online for health information and half of these were looking for information for a friend of relative.
More worrying 75% of these people tend not to bother to check the source and date of health information. Only 15% said they always check this information. This isn't entirely their fault however as a recent study showed that the majority of health websites don't make this information available.
The report gives lots of statistics broken down by age and demographics but if you have any interest in the subject I suggest you look at it in more detail yourself.