I'm starting to investigate social network software. The idea is to help people getting to know each other in my church. The following is just a first collection of interesting links and ressources.
Why Social Software is "bottom up" instead of "top-down":
Some of the more popular examples of social network platforms:
tribe.net and CanYouConnect.com allows to create your own network, e.g. for a sports club or church.
Commercial Software for creating Online Social Networks (only in English unfortunately):
"Vizster": Software for visualizing social networks:
And finally there's even an add-on to the Open Source CMS "Mambo" that provides community functionality: http://www.mambojoe.com/.