“Reddit: Reinforcement Learning Subreddit”, Reddit (, ; backlinks; similar)⁠:

Subreddit devoted to discussion of reinforcement learning research and projects, particularly deep reinforcement learning (more specialized than /r/MachineLearning).

Major themes include: deep learning, model-based vs model-free RL, robotics, multi-agent RL, exploration, meta-reinforcement learning, imitation learning, psychology of RL in biological organisms such as humans, & safety/AI risk.

Moderate activity level (as of 2019-09-11): ~10k subscribers, 2k pageviews/daily