I’ve been working on a history of advice subreddits and subreddit-plot.py generates a useful bubble plot.

Update (2026-10-26): I added r/WhatShouldIDo (2009–Oct, 357K), though its placement is misleading. It was created in the 2009 subreddit explosion yet lay dormant for a decade, with fewer than 140 posts before 2019. Activity then grew modestly, but 72% of its roughly 36K posts came in 2025 alone, the same year its current moderator was added. Its size reflects a 2025 surge rather than longevity.