I honestly think that this sort of &quot;location+tag&quot; functionality should just be built into the operating system, such that there isn&#x27;t any &#x27;infrastructure&#x27; required  but rather the devices themselves have all they need to find each other.<p>I hope it happens one of these days - but things seem to be hung-up on an &#x27;always online&#x27; kind of basis.  Why can I not just type in the words I&#x27;m interested in and find everything within walking distance associated with those words, somehow?  Some third-party always has to be involved: but this is not because of technological reasons.<p>The cyclic nature of these app re-issues is another interesting thing.  The fact that these things keep coming up in the startup-sphere represents more of a &quot;operating system vendors are retards&quot; posture.  Where the startups keep churning, you will find an OS decision that hasn&#x27;t been properly made ..