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Ages back reddit released most of the source code for the site on github (the old releases are still archived here), and at least originally in that code (can't say I've checked the lastest version of what was released) deleting posts didn't remove them from the database, but editing the text did replace the text in the database, so by editing it to an empty string first reddit would only have the metadata about your post.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.