> If there is a community for those who use other rules to compare actual solutions instead of answers I would be interested to hear about it.

Generally you have the main community on reddit (memes, questions, daily thread for sharing solutions), then the language specific subreddits or hosted forums where you will see solutions discussed and shared, plus a couple of new users asking questions.

Also, within the daily main community thread you will see the niche sub community of people posting their code-golfing attempts.