"It was a good through ball by Clint and I was lucky enough to get on to it,"
VOA: standard.2009.06.24
Moreover, it appears that social networking is a classic increasing-returns business, and Facebook was good or lucky enough to leverage it better than anyone else.
In my book, Better Good than Lucky (available for pre-order on Amazon.com), I advocate writing down the reasons that would cause you to sell an investment before you buy the actual security.