Management consultant and business expert Peter Cohan does not plan on investing in Facebook stock any time soon.
The author of 10 business books, including Capital Rising and Export Now, took a look at the social media network's filings for its coming share sale, which could value it as high as US$100 billion ($120 billion), and knew he would take a pass. "Everything is so hyped. They are tapping a bubble," he said.
That sort of scepticism has not been the dominant tone of what must rank as one of the most remarkable weeks in the history of the internet. It saw Facebook complete its journey from its birth in a Harvard dorm room to going public, in a move that will create hundreds of new millionaires among its employees and turn its chief executive, Mark Zuckerberg, into one of the richest and most powerful people in the world - on paper, at least.
Documents filed with the US Securities and Exchange Commission claimed that it had a staggering 845 million active monthly users, half of whom sign in every day, US$3.7 billion ($4.4 billion) in annual revenue and a rocketing growth rate. It also has a very healthy profit margin of 27 per cent.
Yet amid all the merited praise of Facebook's astonishing rise, it is possible to find sceptics about the future.