Facebook is a way for many people around the world to communicate. Facebook is a social networking site with over millions of users. Users are able to create profiles and upload images and videos. User also have control over what is shown on their page.
Youtube is a video sharing site where users are able to upload and share videos. Users use this site to blog. Youtube is an example of online collaboration as it is a open source, simply because users upload and share videos. This also gives opportunities for users to download the videos and remix them.
Wikipedia is a free online encyclopedia built collaboratively. It is accessible and informative. Users all around the world an access and edit any articles and add reference and other form of media such as images. This is another perfect example as anyone can participate. Wikipedia is continuously updated daily.