Professor Howard discusses how computational propaganda on social media platforms impacts democracy. He also pointed out the challenges and opportunities in this research field. He suggests that young scholars can enter the field by collaborating with data scientists and to conduct research on one social platform in the beginning. With respect to the accountability of social media platforms, he suggests that they should publicly release all types of advertising posts to the Ad library, so that the public and citizen groups can analyze through data transparency in order to supervise and hold governments, political parties, and social media platforms accountable.