OK, everyone, raise your right hand, place your left on a bible (or copy of Network World, if no bible is handy) and read these words out loud: "Yes, indeed, I fully expected and told all my friends that\u00a0social networking sites would not only become wildly popular \u2026 but also tidily profitable."Liars, you're all a bunch of liars. Everyone "in the know" giggled when these sites started springing from the ashes of the dotcom bonfire -- everyone. \u2026 At least it seemed that way to this giggler.A BusinessWeek Online article explains why the last laugh -- or at least the laugh of the moment -- is being had by the proprietors of the more popular of these sites.One tidbit from the story: "Facebook, a site for students, is now the seventh-busiest spot on the Web. \u2026 The site's owners, who started Facebook just two years ago when they were sophomores at Harvard, would want as much as $2 billion to sell the company, a senior media executive told BusinessWeek Online."Two billion? Why that's darn near enough to cover Harvard tuition.