Each twitter common adds value. If there are a lot of poshbot comments then there are a lot of tweets referencing a post and it is likely popular. In this case there are likely lots of other comments on the post that make the posh comments a minority. If not then someone is likely doing something unethical and will be dealt with accordingly.
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Ok. I missed that this is a way that someone could post a comment from twitter. I kinda see that, but just like any comment they can spam besides gamifying. Like someone could just be sharing the link to a blog post without actually commenting on it.