[zombieprocesses]

Also, will the deletions be logical or physical. Will they be shallow or deep? Keep in mind that there are many types of "deletion".

Logical deletions would be just marking the user/comment as deleted ( updating a column in a table ) while keeping the data internally. Physical deletions would mean they remove the data on their servers.

Then the next question is whether the deletions are shallow ( superficial ) or deep ( complete ). For example, they can just do a shallow delete of the account/user on their front-end servers. But that leaves back-end servers, disaster recovery servers, staging servers, storage tape long term backups and also log backups.

Even if data is deleted on all live servers, database and log backups stored on tape and sent off to storage facilities still have your data.

Deleting your account/comment isn't as simple as people generally think.