TwentyThreeTired of looking up your friends on 2 or 3 different networks every day? Tired of checking in on all those networks every time you go out? TwentyThree is made for you! TwentyThree (iTunes link) aggregates the position of your friends on all your social location networks and let you see them where they last checked in. But that is not all. TwentyThree also sports a native check-in module which will
