Thanks to Social media users (and communities) share all kind of content and other media. Nowadays, these contents are managed - and moderated - by websites specialized in content distribution and by social networks.

There are plenty of social media websites such as Mashable, Read Write Web and other social media blogs and sites.

• Google   Yahoo   Bing!   Prefered
• Facebook, Orkut, MySpace & BrWeb 2.0 on Twitter