Social software

share bookmarks

 * del.icio.us
 * very useful because of accessing your bookmarks from everywhere
 * tags for every bookmark are helpful to find and organize them
 * see someone's bookmarks (if you know his nick) by entering http://del.icio.us/nickname
 * Wikipedia about del.icious
 * del.ico.us-extension for Firefox
 * extispicious gives you a textual scattering of a user's tags, sized according to the number of times that they've used each of them
 * del.irio.us
 * similar to del.icio.us, but open source
 * content is licensed under a Creative Commons license

share photos

 * flickr
 * you can upload photos and pics and tag it
 * recently purchased by yahoo


 * commons.wikimedia
 * upload pictures and choose your own license (go public domain or "dual-license")

share movies
put your clips online
 * [YouTube]
 * [FilePut]

music
last.fm

networking
not really web services, more remains of the community hype
 * orkut
 * powerd by google
 * openbc
 * business network

meme trading
not really software but still very social
 * BookCrossing
 * FlashMob