(While paying attention to the whirlwind of SNS sites, many people initially focused on the development direction led by the forerunners in SNS sites. Not only do simulators need to carefully inquire about the operation ideas and development trends of the industry leaders, but also the industry leaders themselves are constantly exploring new technologies, content and promotion ideas. The following will take the world's leading SNS website Facebook as an example to comment on the development direction of SNS websites)