The Surgeon General issued this report about it. It is a must-read for anyone looking for or providing advice online:
It was written with Covid-19 in mind, but it is good advice for any kind of illness support.
Darryl does a good job in screening out disinformation (intentionally misinforming patients for commercial gain). But misinformation on this and other forums can be a problem. We are all trying to be helpful to others, and in our enthusiasm, some are not as careful as they could be in what they say. I like the advice the Surgeon General gives: "If you're not sure, don't share!"
There was a very important study on this topic recently. The authors scanned cancer advice on social media on the internet and invited cancer experts to evaluate that advice. They found that about a third were factually incorrect, and almost 80% of those would lead to known harm if followed. Caveat emptor!