Facebook keeps a record of your messages and chats whether you like it or not. Everything you type through the private messaging system is logged by default, though you do have the option to delete these archives at a later stage. Note that deleting messages doesn’t affect the copies held by the other participants in the conversation. They’ll still be able to read through the messages from their own inboxes even if you’ve erased your copy. Tips Writer Bio

How to Delete Archived Messages on Facebook Fast - 57