Trusting information on the internet

When searching the internet for information it is important to be sure your information is trustworthy. For example if you search for a keyword and you end up on http://uncyclopedia.wikia.com you are goofed. This link can look like Wikipedia, but it is not.
Also there is a discussion about whether Wikipedia is to be trusted or not. It is. Wikipedia's reputation is too important for this encyclopedia to be ruined. Yes, everyone can write an article there, but if your article is full of bullshit or even just one mistake, it will be deleted within a few minutes. Therefore wiki is a page you can trust.

But how do you know if you can trust a page? First of all, how is the text written? Informal, formal, passive or partial? Second, have you heard of this page before? Does it have a reputation? Who is the webmaster and what contact information does the page have? Is it a typical homemade webpage with bad graphics or an advanced webpage? Think and be critical!
It is very important to know who have written the article and on which basis? Because facts and conclusions in a partial article can rarely be used for own writing.

My best tips is to stick with the pages you know, like Wikipedia or as I often use the Norwegian online encyclopedia. And if I can't find what I need on any of these I usually use the local library because there you can always find something and there's always books you can trust.