Doesn't have to be significant, and it can be done by upvoting those reviews so they rise to the top without leaving any reviews yourself (and I've heard people

Doesn't have to be significant, and it can be done by upvoting those reviews so they rise to the top without leaving any reviews yourself (and I've heard people talk about using this specific tactic). Conversely, I've heard people complaining their competition left negative reviews and/or upvoted their bad reviews to the top.