From the FAQ:
II. New Thread Etiquette
Show some effort: It's wonderful that you want to start a discussion, but being the Original Poster carries some responsibility to start things off on the right foot. If you're going to create a thread, try to include more content and care than one or two short sentences. Consider whether the thread will generate good discussion, and scrutinize any sources you decide to cite. Try not to create new threads based on tweets, jokes, conspiracy theories, poor sources or yes/no questions. Consistently low quality threads may lead to your thread making privileges being revoked.