Learn about wikis and discover some innovative ways that libraries are using them.
Wikis seem to be losing favor lately as a mode of online collaboration. While I never had much to do with any of them, they did seem ungainly in that one has to sign on and find a conversation topic related to what you want to discuss. Because the information is randomly generated, it can be difficult to pinpoint the part of the discussion to which to add your two cents.
I would be remiss not to point out the usefulness of the mother of all wikis—Wikipedia—because, alongside Google, it may be this librarian's best friend. While I would never recommend using Wikipedia as a source in serious research, it is a wonderful jumping off point for defining a topic and gathering general background information. I also use it constantly to look up the order of book series, and I've never come up empty-handed.