As someone who has been studying history both in academia and on my own for quite some time, I have found the internet to be an invaluable tool. It is something that has made all of the research that I have had to do a whole lot easier to get done, and I will forever be thankful that it exists. Of course, many people who do research on the internet do not do all of the legwork that needs to be done in order to make sure that they are not simply confirming their biases. Rather than trusting a single source for the information that you are looking for, it is very important to take a look at multiple sources, compare and contrast them, and make sure that you can form an educated opinion based upon all of the information that you have looked at.
I think that this is a very important thing to point out, especially for students and other scholars. Just because you find some information about a topic that you are researching on the internet, this does not mean that said information can or should be trusted. I tell everyone who does online research that they ought to make sure that they source everything that they look at and also find different sources that might give them a different perspective. The fact is, if I have a bias that I want confirmed, it will not take me very long at all to find a single source that confirms exactly what I wanted confirmed.
Rather than taking the first source that you find and running with it, you ought to look at as many sources as you possibly can in order to make sure that you have a good basis for any arguments you make.