OK, so https://lesswrong.com is a mix of (1) a blogging platform (same genre as wordpress) and (2) a community forum (same genre as a subreddit) with, umm, idiosyncratic focus.
For the blogging platform part, they built their own blog-writing software. The margin thing is just one of the built-in features.
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For the blogging platform part, they built their own blog-writing software. The margin thing is just one of the built-in features.