It's very hard to rank models' solutions on such problems, which is why they rarely appear in benchmarks (I'd be glad to stand corrected).
Even Opus 4.5 coding a C compiler from scratch - jaw-dropping as it is - doesn't tell the whole story. Most of my tasks are not that well spec'd.
1/ it took me a while to understand this is a social network. I thought it was about giving me more visibility into my sessions/token usage
2/ Unless I am missing something it should be pretty easy to game the system.
3/ I think that landing the user on a global feed of all users will help