It's a bit different rejection story from the most (but certainly not different from all), that difference being Ahmet open-sourced his app, rather then just whining about rejection and burying the code.

And, IMHO, if it wasn't relevant to the community, they wouldn't up-voted it to the homepage.

Also, I agree HN should show subdomains for this kind[1] of sites.

[1] This kind being websites offering subdomains for user-genarated content that is not related to the company which owns the domain.