The "Groan" button seems like it would give people an opportunity to voice dissatisfaction with a comment without also interjecting personal opinion and possibly spawning a new debate.
I think the Thanks/Groan buttons should be more prevalent. Personally I've never felt they've cluttered things up, in fact, just the opposite. The Thanks button eliminates the need for a lot of "Me too" posts, but still allows members to "participate" in a conversation or show support for an idea or comment.
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