Sources say Vedder may have used Reddit the past two weeks. It would make sense for him to post some comments on some major subreddits related to his main career interests or near his local area. Can you help find his account?

The answer format is the username followed by the post ID and comment ID in the URL to their shortest comment, underscore delimited. For example, for this comment, the answer would be MetaCTF{Specialistimran_r5mmdj_hmnszk4}.

Hint: There's a logical way to solve this challenge that doesn't require much time. There are two major (both have 500k+ subscribers) work-related subreddits.