Credibility

The Pacific Tree Octopus is not a legitimate website.  Nor is the MLK Jr. site or the Dihydrogen Monoxide one.  You can tell these are not legitimate because the issues they deal with are fake and in some cases slanderous.  They play off the ignorance of the general viewer and while they are complex, they are still fake.  They don't cite many sources, and if they do, the sources are not credible.  They also use sketchy testimonials and claim wild and outlandish things.

The Explorers website is the only credible one of the group.  It's interface is set up well, and it's easy to navigate.  Also, factual information is given and cited properly.  It also has a more polished look to it, one that the other three don't have.  This alone can give you a good feel for a website.  I was able to look through this site and feel as though I learned something too, things that I could use in a paper and refer back too.