Reading between the lines, I think those that are believers/buyers of the stock undertand that there is a huge base of users and there is now a motivation to monetize that value. Make no mistake, FaceBook will find more and more revenue stream opportunities going forward. I believe Zuckerberg is simply smart enough to know that he could alienate a potentially fickle user base if he makes it all about the money and doesn't concern himself as much with the user experience.
Maybe Q3 or Q4 of this year isn't blockbuster from a profit perspective, but I have a strong feeling that next year and the year after certainly will be.... If you wait until then to buy the stock, it very well may be too late, unless the overall market deteriorates as well in that time frame.