Info on the wiki is all assumed to be in-character knowledge – by whatever means (blogs, memos, conversations with other characters in the bar) your characters are aware of anything they see on the wiki. However, the wiki is a player led tool, and I will make no attempt to correct any facts that are stated there by characters but I know to be wrong. For that reason – the accuracy of wiki information cannot be guaranteed.
Information on the Aurellis sites
Info on the main site is not necessarily in-character knowledge. So you will have to chose whether you think you want to read or not, depending on what events your character has actually experienced and found out. I will generally try and avoid putting false or knowingly wrong information on the main site.