Look at the EDUCAUSE Learning Initiative, the "7 Things You Should Know about..." series.
Ning is an online service that allows users to create their own social networks and join and participate in other networks. No technical skill is required to set up a social network, and there are no limits to the number of networks a user can join. Users of Ning social networks have access to functionality similar to that of more well-known social networks, such as Facebook and MySpace. Various features allow users to read news or learn about related events, join groups, read and comment on blog entries, view photos and videos, and other activities as set up by the network creator. RSS feeds let users subscribe to updates from specific parts of the social network.
Source: EDUCAUSE