When you want an answer to a question, you want it now, which is why the social Q&A service Aardvark first launched as an IM client, then via Facebook, then Twitter. Only today is it opening up its Website as a general social search engine. And it's just a much better interface than the command-line-reminiscent prompts in the IM interface. You still have to sign in or sign up for the service, which sends your question to people in your extended social network (usually on Facebook, but also Gmail or Hotmail contacts) who are also on Aardvark.