I have an urgent question about facebook (see details)?

[Anastasia]

I realize reading this will be frustrating, but I recently had the same problem, and going to the options and deleting the messages or the conversation actually doesn't work, this only deletes YOUR COPY, as I found out the hard way, I am not very good with computers so I have no idea how to hack an account, but my opinion is that you quickly call your friend and tell them to disregard all those messages, I realize this is a disappointing answer but I am afraid that for message or chat, once it is gone, you can never get it back. the only option could possibly think of is somehow getting a hold of your friends computer (most people stay logged into Facebook on their laptops/phones) and deleting it that way, but I have a feeling that this may not be an option for you. i hope this helps in any way possible and i'm sorry i couldn't give a more hopeful explanation!