Friday is here, and with it, VF Daily’s round-up of everything that was important enough to have been Tweeted this week. So many things! Collective marijuana smoking, Icelandic volcanoes, and of course, Mr. Justin Bieber, himself an Icelandic volcano of tweenhood. Let’s take an older, wiser look back over the past five days of Twitter usage, with this, our latest installment of Social Studies: The Week in Twitter Trending Topics.

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