What would I build if the world was round?- (part 2)

The world isn't round, for some people it is round, for others it isn't. I know we've read stories of rags to riches. Anna Vital doesa good job in portraying on her infographics certain stories or fallasies or fantasies or assumptions that ended up being true. Here is an example http://fundersandfounders.com/enough-money-to-start-company/ .

Just like my theory of the world being flat, to the scientist the world is round. Does it matter? No because the world is big and we all will walk down to the point where we fall off the cliff. We die! .

If the world was indeed round, what would you build? Here is what I would do.:

1. I would disrupt the world of advertisements by bringing an invasive advertisement technique to small businesses and other companies(advertisers). I would do so by creating a platform and hardware that uses Bluetooth LE frequency or beacons to transmit advertising to our Bluetooth LE frequency enabled mobile phones or beacon connected mobile phones.
2. The whole system would work within a 100 meter radius. Why? When you are locked in your room, and the internet is the only option to reach you, the local fruit seller a few blocks away has no way of communicating discounts or new deliveries or fresh products to you. Remember you've stopped accepting paper advertisements. This local merchant needs to create an account to a platform, create the ad and send it through the Bluetooth LE transmitter or beacon transmitter. I guess it has to be Bluetooth LE. 
3. In a round world, developing this technology would be a breeze and finding small businesses who would rather send phone enabled notifications than hand bills or flyers would be easy to find. Who said the world was round? I say it ain't round, it is flat.