I don't think this app does information sharing any better than, say, twitter (far worse, imo) - but i find your response puzzling.
Since your issue is not of the quality of content (signal/noise), and instead that of locality.. that you believe you can just walk out of your door and get the same information this app provides - I ask you, can you? Can you walk out your door, and receive similar info to that of this app?
The range on the internet far exceeds most peoples doorstep. Mine for sure, at least.