A suggestion for analysis: Compare topics/sentiment etc. by number of users and by number of posts. Are some topics dominated by a few prolific posters? Posit

A suggestion for analysis: Compare topics/sentiment etc. by number of users and by number of posts. Are some topics dominated by a few prolific posters? Positively or negatively. Also, How does one seperate negative/positive sentiment to criticism/advocacy? How hard is it to detect positive criticism, or enthusiastic endorsement of an acknowledged bad thing?