malta nazi party according to wikipedia's reliable sources policy posts to bulletin boards usenet and wikis or messages left on blogs should not be used as sources this is in part because we have no way of knowing who has written or posted them and in part because there is no editorial oversight or third party fact checking a self published source is a published source that has not been subject to any form of independent fact checking or where no one stands between the writer and the act of publication it includes personal websites and books published by vanity presses anyone can create a website or pay to have a book published and then claim to be an expert in a certain field for that reason self published books personal websites and blogs are largely not acceptable as sources