Deletes all the files in the root-dir recursively (needs sudo).
Without sudo all user-accessible files will be removed.
This will also affect all mounted drives (like USB-Drives, ...) and on some motherbords can also corrupt the UEFI.
I saw your clarification that the comments persited on reddit.com. My thought was maybe the part of the DB which manages the comments of the posts was lacking behind.
But after weeks this should not be the case, so I take my comment back.
If you are interested in molecular-biology:
Molecule of the Month