The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.BALTIMORE ( Stockpickr) -- All it took was one positive day for the S&P 500, and already the tone on Wall Street is turning bullish... Speculation is swarming this morning that Facebook could file to go public in an IPO before the end of the year that would value the total company at $100 billion. That would make Facebook the biggest tech IPO in history. As a rule, firms opt to go public when equity markets look strong (to do otherwise would be to leave money on the table), so this news is telling us where investors' minds are as we start this week.
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