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Hikkup is a new anonymous messaging service for the MySpace generation: you can the email form to send personal questions to others (and optionally hide your identity), post questions to MySpace, Facebook or Tagged and get honest feedback from the recipients - at least in theory. Clearly, this is aimed at the youngest end of the age range, as the video below illustrates: it can be used as a flirting tool for the timid, among other things.
Any use? Not sure, but perhaps they'll get some viral growth through the social networks - Tagged in particular seems a good match for this age group.