<a href="https://news.ycombinator.com/item?id=22516450" rel="nofollow">https://news.ycombinator.com/item?id=22516450</a> I've posted here about the Chinese/South Korean system of a "foursquare" type system for coronavirus seems to be helping contain the spread. How realistic would it be for HN to build something like this? It appears like it would make a big difference.<p>Here's the reddit thread where I sourced it from and relevant information (poster has been verified as being in China)<p><a href="https://www.reddit.com/r/China_Flu/comments/febv3t/what_its_like_in_china_0306/" rel="nofollow">https://www.reddit.com/r/China_Flu/comments/febv3t/what_its_...</a><p>Public areas would take your name and phone number before allowing you to enter, in the event someone there later was determined positive, they could contact you and find you quickly. This moved digitally in QR code based systems, were you would scan various locations, buses, taxis, subways, etc. and be able to be contacted and located quickly.