MySpace is an online community that lets you meet your friends' friends. Create a community on MySpace and you can share photos, journals and interests with your growing network of mutual friends! See who knows who, or how you are connected. Find out if you really are six people away from Kevin Bacon.

Facebook's mission is to give people the power to share and make the world more open and connected. Millions of people use Facebook everyday to keep up with friends, upload an unlimited number of photos, share links and videos, and learn more about the people they meet.

Founded in February 2005, YouTube is the leader in online video and the premier destination for you to watch and share original videos worldwide through a Web experience. YouTube allows people to easily upload and share video clips on uk.YouTube.com and across the Internet through websites, mobile devices, blogs and email.

It is your life online – a social experience that helps you discover what’s going on with your world and helps the world discover what’s going on with you. Bebo combines community, self-expression and entertainment, enabling you to combine, create, discover, curate and share digital content in entirely new ways. Bebo has sites all across the globe.

orkut is an online community designed to make your social life more active and stimulating. orkut's social network can help you maintain existing relationships with pictures and messages and establish new ones by reaching out to people that you have never met before.

Twitter is a privately funded startup with offices in the SoMA neighborhood of San Francisco, CA. Started as a side project in March of 2006, Twitter has grown into a real-time short messaging service that works over multiple networks and devices.

Tagged is the 3rd largest social network in the US, and has over 80 million members worldwide. Members use Tagged to keep in touch with friends and to make new ones

LinkedIn is an interconnected network of experienced professionals from around the world, representing 170 industries and 200 countries. You can find, be introduced to, and collaborate with qualified professionals that you need to work with to accomplish your goals.

hi5 is a global destination where young people meet and play. As the world’s largest entertainment destination, our focus is on delivering a fun interactive and immersive social experience online to our users around the world.

Flickr - almost certainly the best online photo management and sharing application in the world - has two main goals: 1. We want to help people make their content available to the people who matter to them. 2. We want to enable new ways of organizing photos and video.