I laughed at this too, as a few years back at a startup program (hard to describe, not quite hackathon, really idea lab) I spent a weekend working on the exact

I laughed at this too, as a few years back at a startup program (hard to describe, not quite hackathon, really idea lab) I spent a weekend working on the exact same idea as Grouper (3 on 3 dates). We didn't keep going as the founder lost interest when some advisors told him online dating was over (in the disruption sense).