List of socialwares

How many social sofeware are there? Here is a list to start with:

1,Instant Messaging
2,Online Social Networks
3,Reputation Brokers

5,Online tex-based chat
6,MUDs and MOOs
7,Web Conferencing
9,Community Discussion
10,QuickTopic – social annotation
11,Expertise Location
12,Shared white boards or similar
13,Social Network Analysis
14,Recommender Systems