When mining the internet for information one should consider the following:

Who Says - who is responsible for posting the information you are evaluating? Are the sources named? If not, why?.

Quality of the Source - Does the source of information have some credibility in the area on which they are providing information. Is it a Doctor reporting on a health issue or a lawyer reporting on a legal issue or vice versa?

Agenda of the Source - what is the person or organization supporting? For example the National Rifle Association has an agenda to restrict any gun control, so if they issued a report that you found online which concluded that gun control does not result in fewer shootings it would not have the same credibility as a report issued by an independent organization. This does not mean that the source should be discounted, just that its agenda should be considered.

Is Something Fishy - Does something important seem left out? Do you get the feeling that questions that should have been answered were not? A critical user will often get a sense that something is not right.

Fact vs. Opinion - Are facts cited? Are statistics included? Are sources indicated? The more and better the facts, the more reliable the material. Or is it mostly opinion? It is fine for people to tell us their opinions but we must recognize the information as such and weigh it accordingly.