Thing 21 - other social networks

I think that the concept of social networks is a great idea for people with common interests to have a way of connecting. I have yet to find a site/group that has resonated with me though. However, it has been great learning about Gather - I had not heard of it before. I have heard of Ning and have kept it in mind for small group discussions. There are so many options to choose from - blogs, wikis, collaboration tools, etc. - that I believe it is very important to match the tool with the purpose of the event. I also think that it is important to recognize what tools work for you and/or your library but continue to stay of aware of what else may be out there. Thanks 23 Things on a Stick!