If a message or the whole thread is deleted on Facebook Messenger from both ends or in case of a group chat all ends is this content considered deleted? I mean will it be removed somehow like overwritten or anonymized over time? What will be left out of those messages server data then beacause I guess the total removal is not a thing?
I guess that data should be overwrite or anonynimzed but I dont know if deleting chat on both ends only marks the messages as hidden or something