As with any information, it is important to at least make attempts at confirming the accuracy of statements and facts on a web site before incorporating them into your research. How often is this done with information found in print? Not often- and it's done even less with web information although it's more important! The widely-held view that anything "in print" is true now includes the Internet. With journals, magazines, and books, there are at least peer reviewers and/or editors looking at an author's facts, grammar, and spelling before the information is published- most of the time. But publishing on the Web eliminates this process so that information is simply put on the Web, probably without any reviewing, editing, or fact-checking beforehand. That leaves the double-checking up to you.