This was definitely a huge hit for Facebook, and the shares fell down a significant amount, affecting a lot of people. However, I dont think this is the beginning of the burst of the .com bubble. There are a lot of factors that were the cause of Facebooks shares falling, the largest being the recent scandals Facebook has been a part of. After reporting their Q2 earnings, Facebook took a large hit, but they can and should be able to recover from this hit. It will take a lot more for Facebook to fall of the face of the Earth. Another fact I read was about Europe and the new advertising laws, which is Facebooks primary source of revenue.