Basically Facebook grew 12 fold and passed MySpace. Not bad for a site now valued in the $10-15 Billion dollar range. Can I just write a check for $15,000,000,000.00, how about an IOU? As a side note, Facebook reportedly made $150 million in revenue this year, which doesn't justify the valuation in my opinion, though Facebook is very light on advertising so it must be based on increased monetization as well as furutre growth in users. Has a social networking site lasted long enough to justify that kind of investment (see Bolt.com).