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To celebrate the company reaching 100 million users, Facebook employees are holding an impromptu toga party at a park near the company's office on Waverly in downtown Palo Alto, a tipster reports. (Dave Morin, Facebook's ubiquitous evangelist, also Twittered about the party, so it must be true!) Is this the last hurrah for the collegiate youth culture 24-year-old CEO Mark Zuckerberg created, before COO Sheryl "No Fun" Sandberg moves the company to an anonymous office complex next year? It's hard to imagine Facebookers donning sheets and running around the manicured lawns of the bland former Hewlett-Packard building. Here, Sheryl — somehow we can't picture you taking part in toga parties even when you were in college. For you, from eHow, some step-by-step instructions for holding a toga party. Bonus points to any reader who sends in a photo of Zuckerberg in a toga. (Photo by andyfitz)