Edited October 30, 2009 to update the list. The original list is below.

Facebook.com – Number one in popularity by number of monthly visits and number of registered users.
Find me on Facebook

Twitter.com – Twitter, which wasn’t even on the original list, has enjoyed tremendous growth in popularity over the past year.
Follow me on Twitter

MySpace.com – Popular with the younger crowd (18-24), MySpace continues to be one of the most visited social media sites and ranks among the top visited sites overall.

LinkedIn.com – Primarily a business and professional network, LinkedIn is often used to connect employers and job seekers.

Orkut.com – Owned by Google, Orkut is popular with young people in South America and India.

Friendster.com – Currently very popular in Asia.

Hi5.com – Popular with young people in South America and Asia.

Bebo.com – Popular in the United States and United Kingdom, Bebo users seem particularly interested in entertainment.

Classmates.com – Connect with high school and college classmates.

Ning.com – Create your own social network.

Please comment and let us know which is your favorite social networking site and why. And do you network there for fun or for business?

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Original list posted in April, 2008:

MySpace.com – Popular with the younger crowd (18-24), MySpace continues to be one of the most visited social media sites and ranks among the top visited sites overall.

Facebook.com – Another site popular with young people, probably because it was initially for students only. It is now open to anyone.

Orkut.com – Owned by Google and a Google account is required. Orkut is popular with young people in South America and India.

LinkedIn.com – Primarily a business and professional network, LinkedIn is often used to connect employers and job seekers.

Friendster.com – Currently very popular in Asia.

Hi5.com – Popular with young people in South America and Asia.

Bebo.com – Popular in the United States and United Kingdom, Bebo users seem particularly interested in entertainment.

Yelp.com – Users review local businesses.

tribe.net – Another network that is grouped more by geographical location.

Buzznet.com – Music and pop culture communities, appealing o young people.

What do you think? You are invited to comment (just click the title link):
10 Social Networking Sites

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