Reddit is one of the greatest websites in the world. The forum, filled with forums (subreddits) will help you understand and explore any topic you might want.
Finding a subreddit that will both allow you to self-promote, and do so effectively on the other hand is sometimes a daunting task.
Meet Subreddit Finder. Just enter a keyword to discover dozens of subreddits that welcome self-promoting related to your product. The tool will search through the subreddits, reading their rules.
No signup or login is required to use this tool.