The professor was giving a generally good advice for average people. (though of course I do not consider anyone going to Harvard to be average)But the professor is also ignorant of what is going on with the internet (trend) and never saw what Zuckerberg was seeing. But Mark was also lucky because part of the success of Facebook is the continued screwing up of MySpace. I remember Sean Parker saying that Facebook would never have succeeded if MySpace corrected all the little issues they had with users because they already have the network. Network is difficult to break, no matter how good your features are and how much money you have, just look at Google+.