What is Wikipedia?
Wikipedia is a free web-based encyclopaedia that is openly editable. It is one of the largest reference web sites, and attracts around 65 million visitors per month. Articles on Wikipedia are written collaboratively by an international group of volunteers but anyone with Internet access can write or edit articles.
Get started by creating an account at www.wikipedia.org There are various pages on the site to help you get started. At the bottom of each page there is a link to ‘About Wikipedia’, from there you can be directed through ways in which you can contribute.
Another online encyclopedia that allows contributors is: http://www.britannica.com/