Inferring Tweet Quality from Retweets
evanmiller.org
evanmiller.org
That seems a very odd way to define "quality", and the phrase that most comes to mind is "quantity is not quality". Perhaps virality would be a better word for this metric.
Having a tweet score based on those formulae could allow twitter to filter out less interesting tweets from users' feeds. It would be a nice optional setting to have for those users who have too many followers.