If you receive a warning from Facebook like "You don`t have a permission to chat with this person" when your trying to message someone, this means that the person you are trying to chat with is either not on your Facebook friends list or he/she blocked you from chatting with her/him. So, to know which is which, carefully follow the instructions below. 1. Make sure that the person you are to chat with is on your friends list. 2. If he/she isn`t there, send her/him a friend request. 3. If he/she is on your friends list, this means that he/she blocked you from chatting with him/her. 4. Since you won`t be able to ask him/her why he/she bocked you on Facebook, you can either talk to him/her personally or call him/her to know his/her reasons for blocking you.
Read more: Why don`t i have permission to chat with a person on facebook messenger if she is not in my friendlist? - I want to chat with those too who are not in my friendlist. :: AskMeFast at http://www.askmefast.com/Why_dont_i_have_permission_to_chat_with_a_person_on_facebook_messenger_if_she_is_not_in_my_friendlist-qna7539851.html#q475