Would Facebook Users Pay to Use Facebook?

In this article I just read, the question of Facebook's value is discussed.

At the IPO price of $38 that was announced Thursday evening, Facebook is priced at the top of the $34-$38 range announced at its filing. That pegs the company's total value at an opening-day record of $104 billion -- and it will have roughly $16 billion more in its coffers come Friday morning. Put another way, Facebook CEO Mark Zuckerberg now has enough cash on hand to buy 16 more Instagrams.

But some are concerned it'...