Is there a statement of mission, purpose, target audience?
Does it provide many opinions? Balanced?
Does it contain mostly opinions or facts?
Is there bias in the information and opinions presented?
Is it selling? Promoting? Ranting? Sponsoring?
Does the source represent the agenda of a political, religious, or social group or institution?
If there is advertising, is it clearly differentiated from the informational content?
How? Determining What's What
It's ok to doubt. Scepticism should be the rule of thumb when searching the Web.
Double-check the facts and sources. Find the information in another source.
Find other web pages that link to this page. If other pages link to a site, then they recommend that site for one reason or another. Why do they recommend it? They could be fans or detractors of the site.
Check the WHOIS records. Search for the web address to find out who registered the domain name.
Do a link search in Google, Bing, or another search engine that provides this feature. In Google, type link:<<insert url>> into the search box. If you find no links, try a shorter portion of the url, stopping after each /. ex. link:http://www.washington.edu/
Look for more info about and by the author Googling someone can be revealing, but be sure to consider the source. If the viewpoint is radical or controversial, expect to find detractors.
In Google, search for the name as a phrase. ex. "Jane Doewebauthor"
In Google, search for the name as a phrase with * between the first and last name. ex. "John * Doewebauthor"