not useless enough. slap a QR code on anything, document it, annotate it, discuss it. for sure you can come up with a rev model... if people are in there too

not useless enough. slap a QR code on anything, document it, annotate it, discuss it. for sure you can come up with a rev model... if people are in there too long offer Ducolax... other context-based offers and ads... let people report when stuff needs servicing