We'd like to revisit social signals for your website.

A "social signal" is an internet service or feature that allows you to share your web pages to other members within your online circle of friends.

Wikipedia currently maintains a list of 198 popular social networking websites. Each of them has their own method of sharing links and information amongst friends.

Search engines are slowly tapping into the popular social networking sites and beginning to measure and include intra-member communications (i.e. sharing and liking) in organic search results.

According to Wikipedia the top social websites listed by member totals are:
1. Facebook
2. Qzone (China)
3. Habbo (teen website)
4. Twitter
5. Windows Live
6. Bebo
7. Vkonatakte (Russia)
8. Tagged
9. Orkut
10. LinkedIn

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