The only way I could see it working is if you could easily send an integrated experience to a user who does not have the app. This would need to be from the web

The only way I could see it working is if you could easily send an integrated experience to a user who does not have the app. This would need to be from the web, have access to the camera, or ultimately download and install the app in the background. If the early adopters of Slingshot do not need to care about who uses slingshot, and its rather seamless for the receiver, I could see the install base spreading quickly. That will make things easier. Then again, its a trick. I think what remains to be seen is what sort of interation this enables, which prudently I suppose I'd say its too early to tell. Conservatively I'd say the numbers are against it.