Not bragging here, but a while ago I used IFTTT to create a system where I created a quasi-alert system for a local legend/mentally ill guy who wanders the subway in my city. Everyone knows him, but sometimes he disappears for a month or two and people online start to talk about where he went.

I began wheatpasting a photo of him with a QR over his mouth (he often says the government/big corporations are trying to kill him) and the phrase "have you seen me?" around the subway stations he's usually on. The QR code went to an SMS #, which caught an IFTTT trigger to turn that SMS into an email (to an anonymous Gmail account) which, upon receipt, caught another IFTTT trigger and posted the text of their message to a Tumblr account -- one seamless workflow. This way, people could in more-or-less real time keep tabs on him and how he's doing.

It went well until the police took down the posters, of course. Haven't thought of a way around that, yet.