I'm only jumping into this discussion because it's an interesting dilemma for an introvert.
I like that in Canvas folks cannot see who Liked their post. I'm an instructional designer, I do not have any direct interaction with students... unless I've pressed Like on their post. That's it, that's all I want to be able to do, especially for discussions where students are problem-solving with each other. I want to give kudos to that, but I do not want them to know it is me! I'm nobody to the student. 
I also want to go back to @James comment about using percentage read as part of the analytics for grading. That's really intriguing!! I bet it only works for those with admin access eh? So yeah I can see Steve's point about maybe a flag/toggle to allow teachers and TA roles to see how those likes are.
My new adjective lately (this year) is Disruptor. So as the disruptor, wouldn't it be funny to have a dislike button too. Oh man and then the stress that would cause as students suddenly felt hated and not just un-liked.
I like having the Like button on Canvas discussions to avoid those "good job" and "I agree" posts, but that's probably me being naive in thinking that users will use the like button for that reason and not for some kind of social currency thing.
ok, I'm done rambling--time for dinner:smileycheck:
Cheers - Shar
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