Some students might have questions about the content that you find funny, and no other method to get answers than post on Piazza. I hope you don't think the "hilarity" of these posts makes it okay to put down their to get an education and understand concepts.
What happened to good ol' fashioned newsgroups for CS courses?
Back in my day, we had this one guy who always posted on the newsgroups a couple hours after the midterm/exam asking when/where the test was being written. Obviously he used a fake email so this wouldn't work on Piazza...
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