Reliable Websites

who what why where?
The internet provides us with extremely fast and easy access to lots of information. However it is vital that researchers don't believe everything they read on websites. an important research skill is knowing how to check if a source is reliable. In my research i will need to take the following factors into account:
Who:  who wrote the information? are the people who add content to the website reliable and knowledgable? Is it the appropriate to answer your questions? There is often a 'about us' link which might tell you this information.
What: What kind of websire is it? Blogs and forums are contributed to by the general public, their information may not be so reliable. For example when using wikipedia as a source you must take into account that almost anyone can add information to it, although it may be difficult sometimes it is still possible.
Why: why is the information there? People often use the internet as a persuasive tool. For example a band trying to promote themselves will say they are extremely popular and make the best music on the planet. This of course is an extreme exageration of the truth and a very opinionated statement.
When:  when was the information entered? I am researching quite a modern topic. A website from 2000 will have little information on the effects of TV on demand because it did not exist. checking the dates a website was last updated is important as the information may have changed.