Is there any existing survival social network ?

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I was wondering if there is any application / social network whose purpose is to organize people's goods/production/abilities. Let's say John is living near James (their proximity is known because of the GPS device of the app). John has 100 kg of rice and also a garden where he grew potatoes. So, John has goods (rice), a production of potatoes and an ability (gardening). Now, in time of crisis (or pre-crisis), he meets James via the app. James has also some stock of goods, a production (chicken coop let's say) and he is a doctor in his daily life (so it's his ability).

The idea is to pre-organize small community. The geolocation is a big plus. If there is an inventory device in the app, we could see in a specific and close area a system of a common stock ( John trade with James his surplus without any exchange of money, just barter). Also everyone could count one the abilities and production of others. You don't have to grew vegetable if you don't have the ground or the ability.

Also, one big plus is to avoid any panic reaction like we can see in our days. If you know that one your neighbour (the geolocation is not too precise in order to avoid theft) has x stock of something, you can avoid the shortage fear.

Finally, even without any crisis, this app would be an alternative to the actual state and big compagny's control of our economic life.

I know that some communities are already living like that (or trying) but my question is about the existence of an app/network that would ease this task ? And if not, what do you think about the utility of creating one ?

Sorry for my english it's not my mother tongue.