Why Facebook's IPO Could Stall Until 2012

Facebook's only just announced that it's achieved 500 million members--which is a meaningless number, if you think about it, but a huge mental sign that the company is achieving success: It means roughly one in 10 humans is on the service.

The about a delay to Facebook's plans to IPO comes via Bloomberg, which has heard from several sources close to the company. The change is apparently to give the company to further boost its member figures, and hone its business model (though making