Your messages are assigned point values based on the characters they contain. Common characters, as judged against the database of existing messages, are worth less point, uncommon ones more. Your message will only be published if it contains exclusively valid dictionary words. Of course, there is an arbitrary but just-big-enough character limit.
You can’t just see whatever content you desire. The average point score of your last x messages is taken, and only content with similar scores is displayed to you. Do you try your best to get in with the thesauruses, or will you be content shitposting with the scorelets?