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At my University, where I both worked and studied, we had a second semester senior post his automatic registration script to the school's Facebook group. This sent up alarm bells and I sent emails to warn the appropriate people, but it was the night before registration. The load immediately and totally crushed the system, and registration had to be rescheduled. They switched around some tags on the page (the script did very fragile webscraping), and that was enough that there were no more issues. The student had to fight an academic misconduct trial for it as well. A painful situation all the way around.