Was using Google for searching a Tracker error when I *stumbled upon* a 'Removed-output.txt' file (2015-01-08 22:05) which appears to list all particularly helpful moodlers. User id's #'s and full names + what looks to be a 'rating'. Looks to be a /secure/attachment/.
While it's old (2015) there are still lots of folks listed there who are still active.
Just thought I'd share ...