Hi Andy, if you look in the upper right corner of any thread you will see a "Rate this thread" button. For the threads that have stars, it means that someone has clicked on that button and given it a rating.
If more than 1 person rates a thread then it takes the average, if one person clicks 5 stars and another person clicks 3 then the thread description should show a 4 star rating.
Hope that answers your question
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