The $100 billion question following Facebook’s IPO filing earlier this month: Will Mark Zuckerberg’s behemoth possibly justify that valuation once trading begins? The public is already answering. As with most frenzies, emotion, not reason, wins the day, especially when the majority of stock buyers have an intimate relationship with the prod­uct. To gauge the IPO’s prospects, we asked General Sentiment to track and analyze the online chatter, including Twitter (privacy…