1. A method in a computing system for adjusting an authority measure of a distinguished author on a topic for a current period that is preceded by earlier periods: identifying articles posted by the distinguished author on the topic during the current or earlier periods; identifying stakeholder authors that cited or posted articles on the topic during the current or earlier periods; for each identified stakeholder author, determining whether the stakeholder author cites during the current period an identified article posted by the distinguished author; and adjusting the author authority measure of the distinguished author on the topic based on whether the stakeholder author cites during the current period an identified article posted by the distinguished author.