3. The computer-implemented method of claim 1 , wherein: the quantity of interactions, by the first group of authors, with the posts that the first author has submitted to the messaging system includes a quantity of comments that have been received as replies to the posts that the first author has submitted to the messaging system, and the quantity of interactions, by the second group of authors, with the posts that the second author has submitted to the messaging system includes a quantity of comments that have been received as replies to the posts that the second author has submitted to the messaging system.
3. The computer-implemented method of claim 1 , wherein: the quantity of interactions, by the first group of authors, with the posts that the first author has submitted to the messaging system includes a quantity of comments that have been received as replies to the posts that the first author has submitted to the messaging system, and the quantity of interactions, by the second group of authors, with the posts that the second author has submitted to the messaging system includes a quantity of comments that have been received as replies to the posts that the second author has submitted to the messaging system. 4. The computer-implemented method of claim 3 , wherein: the score for the first author is further based on a quality of the comments that have been received as replies to the posts that the first author has submitted to the messaging system, the score for the second author is further based on a quality of the comments that have been received as replies to the posts that the second author has submitted to the messaging system, and wherein a quality of each comment is determined based on a substantive nature of text in the comment.