I read Shortened Link Cleanup Time! a few days ago, and since then have been on the lookout for shortened links. However, occasionally I find a shortened link in a comment, and comments, unlike questions and answers, are not editable.
What should I do with these comments? Should I flag them under "Other" and include an explanation, should I contact the commenter and request that they re-post their comment but with the expanded link, or should I inform a moderator?