This is not exclusive to Kuwait. I've seen several of these kinds of storefronts all over South East Asia. People use an app like "Line" to order stuff and communicate payment options . It's really interesting to see how people use social networking in unintended ways.

Most of the stuff that is sold is relatively cheap (< 15$), but trust is still a big problem. In my time there, I always wondered if it would be worthwhile for Facebook to facilitate this by for instance handling the payments, but I don't even know if they knew about this kind of stuff happening.