There is a way where by you can kindly ask the person to stop messaging you.
You can stop someone by sending message only by blocking that person from your Facebook. Messages will only be stopped when you block the person who is stalking.
If the person is stalker you can block his profile for you. And if the person is your friend you can poke back.
When you block someone on facebook they have no access to anything of yours on facebook. If they type your name is search nothing will come up. If you and the blocked person have a friend in common and you post something on your friends page and the blocked person see's it your name will come up as Facebook user. As well when you block someone you are blocking yourself from them aswell. So the same rules apply to you aswell.
You can report the person on Facebook and the relevant authority if you get cyber bullied.
You sure can, then if, in the future they unblock you, you'll still have them blocked.
You cant, If you block someone he/she will not be able to find you through searches or by any software unless you unblock that person.
go to their profile and where it should say add this person, should say something like block this user
You could try Account / Privacy Settings / Block Lists and add the person's name in the block users box. The help text for this facility says: Once you block someone, that person can no longer be your friend on Facebook or interact with you (except within applications and games you both use).
You can't know. For the person's sake they block you from being in any of their posts ect..
how to block messages of unknown person on facebook
No
No, if you block someone on Facebook, they can not see any of your activities