This is because PageRank doesn't look at "retweeting" - forwarding a tweet to other users, which is an important measure of a tweet's importance.

因为PageRank不考虑twitter上的“ retweeting ”——转发消息给其他用户，而这是衡量消息影响力的一个重要指标。

youdao

Readers were tweeting their own thoughts and comments about their insight, not just retweeting the post title.

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First, it is ethically-questionable whether users with public streams should be retweeting private tweets without express consent.

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People who receive malicious messages and pass them on, such as by retweeting, could also fall foul of the law.

BBC: Prosecutors clarify offensive online posts law