K. Kickstarter

A somewhat new addition to the World Wide Web, Kickstarter allows projects, regardless of their size or nature, an opportunity to get off of the ground, allowing users to present their concepts and attract different levels of funding for it, enabling those who may struggle with traditional promotion channels to source financial backing.
L. Lastfm
Offering a highly unique concept, Lastfm records the musical preferences of its users and offers a selection of similar alternatives for their listening pleasure, allowing individuals to source potential new additions for their music libraries. An honourable mention goes to LinkedIn, a commercial-orientated social site that allows users to network with their fellow professionals, with the provision of online CVs also allowing for corporate headhunting to take place.