Ever wonder who said something first on Twitter? Now that Twitter's opened up its archive of tweets, you can easily figure that out. Who Said It First is a search tool that'll help you do just that.
All you need to do is head to the Who Said It First search page, type in your search phrase or term, and the web app will hunt down the first tweet it can find. If nothing else, it's a helpful tool to find an original source tweet or for whatever random lexicography research you might be up to.