It's the same issue with Google Search, any web page, or, heck, any book. Fact checking gets you only so far. You need critical thinking. It's okay to "learn" wrong facts from time to time as long as you are willing to be critical and throw the ideas away if they turn out to be wrong. I think this Popperian view is much more useful than living with the idea that you can only accept information that is provably true. Life is too short to verify every fact. Most things outside programming are not even verifiable anyway. By the time that Steve Jobs would have "verified" that the iPhone was certainly a good idea to pursue, Apple might have been bankrupt. Or in the old days, by the time you have verified that there is a tiger in the bush, it has already eaten you.