As always, this is the greatest idea ever, spontaneously meeting like-minded people/social discovery. Hundreds of startups have tried it and this idea pops up o

As always, this is the greatest idea ever, spontaneously meeting like-minded people/social discovery. Hundreds of startups have tried it and this idea pops up on the HN front page every couple of months. However, it has never worked out. Again, not trying to shoot your app down, it is the greatest idea ever, but if you want to spend a significant amount of time on this now, you should be aware of this: Why did none of these work out? High CPA, incredibly high critical mass and churn. It will be very hard for you to acquire users as the only targeting you can do is "sports", very broad and very competitive. Secondly, your critical mass per city to cover all sports is around 10,000 users. Only then, will your users be able to find activities to join when they want. However, 10,000 users per city is very, very hard to get. This is the main problem why all the social discovery apps even with millions of funding didn't manage to gain traction, see Highlight, Solar.me, Spots, Spontacts etc. Lastly, as your app doesn't address a certain customer, your users won't be able to identify with the app much and this will make it hard to keep them. Hope that gave some insight.