no
Don't delete them
Press the 'x' button.
its means chocolate milk -_-
if you delete it then yes, it will delete on theirs too
No, you can't. Once a message is sent, it can't be unsent.
I dont think you can but you can delete an inbox message which will probably clear the chat?
To completely delete messages, you have to delete them one at a time in the archives. There is a site called fbsweeper that will delete them for you all at once. It is much easier than doing it on facebook.
Just slide the unwanted message or chat to the left and press delete
message them and ask them to remove it
As long as your Facebook account is active and set to public you'll get messages. Either set it to private or delete it
It will stay archived until you delete it, otherwise it won't be deleted but it will reappear to Inbox if the person sends you another message.