The second one.In my opinion, the widespread dissemination of a person's content by others shows that the person's content affects others, and the power is one person's ability to influence another person. Therefore, the most powerful person is the one who disseminates the best information in the network.
There may be different answers. Because there may be a situation where the person's power is not great, but people are interested in the information he sends, which makes the news spread widely.
I think these methods are good methods, because they can basically judge whether a social group has power and influence without paying attention to the content. But these methods can only be used without considering the content of published information.