inSpot, the service that lets you send anonymous ecards to past partners you may have exposed to an STI, has hit 30,000 users and a burst of really fair press. Where once there was disbelief — that anyone would ever send a message through a web app about infectious risk to someone they’d slept with — now a study in the Public Library of Science’s journal of medicine confirms that user adoption isn’t the problem. Of 50,000 cards sent, “29,137 people accessed STD testing information as a result of receiving an e-card.”  Or, if we’re a generation happy to click-through to a lover’s status message on Facebook, why wouldn’t we click-through to make sure we can still sleep with them?