There should be an option to react to a song that someone on your Friend activity feed is currently listening to. Reactions could be a simple thumbs up 'like' or a pre-set comment. Reactions could also be saved together on a separate page.
Updated on 2018-06-15
A similar idea has also been suggested here:
Please vote for it, and add a comment there, so it may be considered. Any update on the matter should be posted there. :)
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