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PALO ALTO — How was Facebook's toga party, held to celebrate the company's 100 millionth user? We couldn't sit back and just read the status updates. So we sent a Valleywag spy deep inside the social network's headquarters. At last, the answer to the question, "What do you get when you mix 5 kegs of beer and a case of champagne with hundreds of geeks?" Alas, we just missed Zuckerberg — he's not known as a big drinker. But even COO Sheryl Sandberg, known for quashing every sign of fun at the company, showed, and grudgingly allowed herself to be wrapped up in a toga. The photos: