Users can create a microblog and connect friends, posting from the web, by SMS, or from desktop clients.

An internet radio and music community website and social music platform. Uses a recommendation system known as "Audioscrobbler", to build a detailed profile of each user's musical taste.

Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Home to a number of signed and unsigned underground artists, this site offers such features as profiles, blogs, member polls, instant messaging, live chat, and email.

Offers profiles, friends list, blogs, galleries, articles, and forums.

An online service to create, customize, and share a social network.

A free social networking and dating website that also offers features that include blogs and member-created quizzes.

Social networking and discussion site operated by Google.

In this photo website builder and community, users can add items such as images, text content, videos, glitters, shout-outs, and profile pages.

A social dictionary allows its users to define their world.