PUBLIC MARKS with tags social & free

Social networking + bookmarking + blogging + photos + etc., all in yummy AJAX

''Simpy indexes your bookmarks and lets you search them. It eliminates the need to use bookmark folders (also known as categories) by using tags to create virtual, dynamic folders on the fly.''

Snippets is a public code repository. You can easily add code to your personal collection of code snippets, categorize your code snippets with keywords (known as 'tags'), and share your snippets via this site.

Ning is a free online service (or, as we like to call it, a Playground) for building and using social applications. Social apps are web applications that enable anyone to match, transact, and communicate with other people.

Join the social music revolution at Last.fm. It's fun, it's free, it's all about the music. You get your own online music profile that you can fill up with the music you like. This information is used to create a personal radio station and to find users who are similar to you. Last.fm can even play you new artists and songs you might like. It's addictive, it's growing, it's free, it's music.