Spam comments are irrelevant or repeatedly posted comments, and forbidden in the Terms of Use, 3.5:
“Prohibited activities include ... Repeatedly posting the same material, or "spamming"”
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https://scratch-mit-edu.ezproxy.canberra.edu.au/terms_of_use/
More info: http://wiki.scratch.mit.edu.ezproxy.canberra.edu.au/wiki/Spam.
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