Ning UPDATED!Ning has changed a great deal since I first blogged about it in 2006. It went from being a place where you could create and/or clone lots of social "apps" to a place where you can create your own social network(s). In other words, you can create a network that works similarly to MySpace/FaceBook/Live Spaces, but tailored to your needs. I think usage has fallen off a bit, but you may still find a good use for it, especially in a school setting where Facebook may not be allowed.
Music Genome Project to create radio “stations” just for you based on the names of artists or songs that you stipulate. You can share your stations, rate the songs played on your station (to better “tune” the music they send you), check out the Top 20 stations…. Lots of fun!
A List of Social Bookmarking AppsHere’s a list of the social bookmarking apps I have checked out - there’s sure to be one here for you.
del.icio.us - Easily the most widely used. One of the first to “tag.”
MyWeb - Yahoo's latest entry
Netvouz - Has folder organization as well as tagging
Diigo - This used to be FURL. This is the one I use - it takes some time to learn all the ins and outs, but I like it a lot.
Tumblr - Creates a links "blog" rather than just a list
Connotea - Designed for “business” - looks business-y, works like the others
Wists - Called “social shopping,” this is like a wish list on steroids. Love it.