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And yet there's one feature we can all agree Twitter needs: groups. So much, in fact, that every new service offering some kind of Twitter grouping gets a mountain of buzz. The latest to catch our attention: the inventively-named "Twitter Groups", hosted at TwittGroups.com. It's technically unimpressive, however: all you can really do is join a group of people interested in similar things and view the Twitter Search results for that group (something you could easily do by using a shared hashtag).