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By far the most complex portion of the comments system was how dynamic it was going to be. Threads would be zipping in and out, we’d be creating 90% of the HTML dynamically in the DOM from JSON, posting and editing over AJAX, etc. It was during design that Micah and I also plotted to remove script.aculo.us and replace it with the smaller jQuery library. The entire comment system is, in fact, a series of jQuery plugins.