i have a face book page facebook.com/itpkcom i want that when i creat a post it automatically posted on the wall of the users who has liked me.
"Automatically" is not a method allowed on Facebook. You can not use an automated method to post anything to anyone's wall. In order to show a post on their walls, simply update your Facebook pages status.
By updating your page status, or posting something on your own page's wall, it will automatically show up in your fans' newsfeed. But you can't auto-post to their wall, you would have to write on their walls individually, one at a time Graeme