Traditional information sharing will delete a file in order for stop sharing the file, and after shared a message, the message cannot be stopped for sharing. This invention discloses method and system for user posting (sharing) or un-posting (stop sharing) files, folders, and messages by deploying dynamic workspace technology. The stop sharing file or folder will not delete actual file or folder, so that the file or folder can be shared again to other users without requiring to recreate the file or folder. The un-post message operation facilitates a user to delete or withdraw his/her previously posted message from user interface (UI) of a recipient such that the user can avoid embarrassing if the message is not proper. Specially, a sharing control list is provided to user to control stop sharing files, otherwise, the user may do not remember how many files being shared with how many recipients.