9. The computer system of claim 8 , wherein the program instructions to identify comprise: program instructions to identify the particular experts as ones that have activity relating to the topic within a period of time from a current time at which an identification is made, wherein, for each one of the particular experts, the amount of activity of the particular expert is used to determine the likelihood of participation of the particular expert.
9. The computer system of claim 8 , wherein the program instructions to identify comprise: program instructions to identify the particular experts as ones that have activity relating to the topic within a period of time from a current time at which an identification is made, wherein, for each one of the particular experts, the amount of activity of the particular expert is used to determine the likelihood of participation of the particular expert. 10. The computer system of claim 9 , wherein the activity is publishing papers, and wherein the published papers are related to the topic.