I use the wikipedia everyday! Wikipedia has become one of my favorite websites as it's the easiest way to corroborate a fact, get a picture or get quick information about someone or some place. I learned from the beginning of the wikipedia that it was created by other people and that when something was not truth or a fact was inexact you could contribute providing a different opinion, editing and saving the text. That is called wiki.
Using wikis in a classroom constitutes an excellent tool to make students participate and provide their ideas. In an organizational setting using wikis help the members to share information easily and in real time.
The following video explains how a website: wetpaint may help you create your own wiki and get in touch with people with common interests.