Blocking someone on Facebook?

[Gabrielle]

Ok so I use to talk to some boys on Facebook in 2011 and today I went on their profiles and clicked message to see if our messages are still there, and they are but our conversation is really shame. Is there anything I can do so that if they message me the can't see our older messages on their account? Unless they deleted them, but if I block them then unblock them, will they still see our messages or will they be gone?

[abraXus]

nothing will get rid of the messages in their account - not blocking them, not deactivating your account... nothing

[Jason]

Only way is to hack his account and delete the message, and it's illegal and you may get arrested under cyber crime. And don't worry, coz, guyz like that don't hang with only one.. now probably he's inbox is filled with tons of messages and your messages has been gone underneath.. and take that as a lesson, GOD is always watching you what ever you do in private, be more cautious when it's come to internet. Unfriend him and block him without his intentions so he'll totally forget your conversation but BE CAREFUL when you block him, cause if he get attention and may be he'll get angry or something and may use the conversation against you. Learn to take your every step with cautious in life.