Wikipedia

Social Media Platform 

Wikipedia is a free, web-based and collaborative multilingual encyclopedia project supported by the non-profit Wikimedia Foundation.

Wikipedia holds over 3 million articles in English that have been written collaboratively by volunteers around the world, and almost all of its articles can be edited by anyone who can access the Wikipedia website.

Wikipedia is a global information wiki. Almost every article may be edited anonymously or with a user account. Registered users may create new articles (only in English edition). No article is owned by its creator or any other editor, or is vetted by any recognized authority; rather, the articles are collectively owned by a community of editors. Changes to articles and entries are immediate: no review is conducted at all.

Each article has "Discussion" pages associated with it which are used to coordinate work among contributors who often maintain a "watchlist" of articles of interest to them, so that they can easily keep tabs on all recent changes to those articles.