[hkuo]

Just want to add that of course, you'd be able to integrate food ratings, friending, favoriting, etc etc etc all that standard social stuff, but IMO, in order for this to be successful, you should consider boiling it down to the absolute simplest of functions and tasks to minimize user friction.

So with the above idea, I would recommend the user need only simply 3 things: 1) photo 2) restaurant 3) whether they liked it or not and an optional 4) description.

If it's an iPhone app then you automatically pull geolocation, but if it's through email, I'm not sure how this would be done and you'd have to explore what you can do.