I've played with Thinglink and Stipple, but how does iO9 have annotations that link as comments?
http://io9.com/this-is-not-an-error-in-your-map-app-it-is-a-real-ro-510778682
http://io9.com/this-is-not-an-error-in-your-map-app-it-is-a-real-ro-510778682