Create your own space and invite your friends.

Flickr is an online photo management and sharing web site.

Geocaching is a popular activity where you use GPS to find hidden containers. It's like a world-wide scanvenger hunt where you become the search engine. People hide containers and register them on the web site. Others go looking for them following the location information (lat/long) and clues (if needed).

Professional Networking site.

Personal messaging site.

MySpace is an online community that lets you meet your friends' friends.

Broadcast yourself or watch others broadcase themselves.