Guerilla is arguing that the value of a company is derived from whatever people will pay for its stock at a given time.
I'm arguing that the value of a company is a product of its balance sheet and financials, or as I said up top a few posts ago, that the value of a company can be derived from what its customers (advertisers) are willing to pay for its product (ads).
FaceBook is now public, so it's value is derived from it's stock price and the # of outstanding shares, it's market capitalization. If Google wanted to buy FB, they would have to pay AT LEAST the current stock price or none of the boardmembers and stockholders would accept the offer since they can sell right now at the current price. It's illogical that a company would ever be bought for less than the current stock price, it just doesn't make sense.