If you're not keen on modifying core, this will be resolved here:
Link Preview Image Ability to toggle NodeBB's X-Frame-Options · Issue #1616 · NodeBB/NodeBBSo if you decide to embed NodeBB in Facebook for example, all you have to do is check this off in the ACP. Relevant code: https://github.com/NodeBB/NodeBB/blob/master/src/middleware/index.js#L204 Original thread: https://community.nodebb...
faviconGitHub (github.com)
EDIT: Maybe we should embed our community on Facebook as a page, just for fun 😉