1) http://www.digg.com/
Digg is a website for people to discover and share content such as news, videos and images, from anywhere on the web. It is a promotion tool.
2) http://www.delicious.com/
Delicious is a social bookmarking service that allows users to tag, save, manage and share web pages. Delicious improves how people discover, remember and share on the internet.
3) http://www.flickr.com/
Flickr is an online photo management and sharing application. The site helps people make their content available to the people who matter to them and also enables new ways of organizing photos and video.
4) http://www.fark.com/
This website is a news aggregator and an edited social networking news site.
5) http://www.lifehacker.com/ Lifehacker is a technology blog which looks at products, software or gadgets and look at how they make the work or play faster, more efficient and more fun.
