a Hpmor subreddot seems the most obvious to me.
An actual mathematics/logic/decision theory that's heavily moderated like stack-exchange seems like it would be useful for the people who can hack it and useful to separate from the regular stream of content when trying to attract further mathematicians. Is it possible to limit posts to certain subreddits to only those with vetted privileges?
A "stupid questions" or "questions about the sequences" subreddit could be useful for new people as well as to further discuss old but interesting material.
Less Wrong is based on reddit code, which means we can create subreddits with relative ease.
Right now we have two subreddits, Main and Discussion. These are distinguished not by subject matter, but by whether a post is the type of thing that might be promoted to the front page or not (e.g. a meetup announcement, or a particularly well-composed and useful post).
As a result, almost everything is published to Discussion, and thus it is difficult for busy people to follow only the subjects they care about. More people will be able to engage if we split things into topic-specific subreddits, and make it easy to follow only what they care about.
To make it easier for people to follow only what they care about, we're building the code for a Dashboard thingie.
But we also need to figure out which subreddits to create, and we'd like community feedback about that.
We'll probably start small, with just 1-5 new subreddits.
Below are some initial ideas, to get the conversation started.
Idea 1
Idea 2