Successful discussion boards include participation of professor on the discussion board. As I scroll through and interject, I read most of the discussions posted by my students over the week(s) that the board is open for participation. If they have completed the post satisfactorily, I use the Like option. At the end of the grading period, however, I find that I am re-reading many of the post (given they post 2-4 times/board). To prevent this redundancy (and save time), and to keep me motivated to continue being present on the discussion board, it would be excellent if I can see that I already Liked the post.
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