The site does not have a system that filters the correct answers from the incorrect answers. At one time, the community could vote for the best answer among the posted answers; but that option was disabled in March 2014. For most of the life of Yahoo! Answers, once the "best answer" was chosen, there was no way to add more answers nor to improve or challenge the best answer chosen by the question asker; there is a display of thumbs down or thumbs up for each answer, but viewers cannot vote. In April 2014, this was changed to allow for additional answers after a best answer is chosen, but the best answer can never be changed. Also, while "best answers" can be briefly commented upon, the comment is not visible by default and is hence hardly read. Even the user who posts the question isn't notified, before or after the best answer is picked, about a comment on the question or on the best answer. If the best answer chosen is wrong or contains problematic information, the only chance to give a better (or correct) answer will be the next time the same question is asked.