Social media.

WIKI, Blogs, RSS and Micro Blog's.

A WIKI is software that runs a wiki or a website that allows users to collaboratively create and edit web pages using a web browser. For example; Wikipedia.

A Blog is a  web based mechanism to allow discussion on a topic on the web. For example; Blogger.

A RSS or 'Real simple syndication' is a group of web feed formats used to publish frequently updated sites and topics. For example; Twitter.

A Micro Blog is different from a traditional blog because its content is typically much smaller.