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Fair enough. You realize the 'nut' of this particular problem is capturing the 'free/busy' state. Capturing state requires a two things, a 'probe' (something which measures) and a 'policy' (something which looks at the measurements and produces a finding). Fortunately, in your particular case, the challenge of creating a probe which can measure 'busyness' answers your question (which is effectively 'No' btw). Chat pr…
I must have worded the question wrong to begin with but the button you were referring to was exactly my line of thinking. Situation: I'm at home and feel like meeting up with a buddy of mine and am having this problem. I launch the app and click a button that says I'm bored and would like to meet up with one of these people I'm 'following'. This then bring up a list of the followers that are free as well and the SMS…
You can build it with Corona [1] pretty easily, even if you haven't done much programming they have excellent tutorials. Then spin up either and AppEngine instance or EC2 instance to handle registration and its good to go. Do it for one of the Disrupt hackathons and maybe win a prize even.