1. The best quality may be decided by multiple number of readers on the same topic who might have went through other contents on the same topic. Their vote on the topic can be decided by the amount of satoshi they tipped for the content and how many number of readers tipped the content

Additional weightage for visibility can be given for authors who are already having posts in the similar topic who are already tipped on the same topic before. Increase the kilometer visibility for the articles based on these weightages and the best quality contents will keep pushing for higher and higher visibility