In this video, Motley Fool analyst Andrew Tonner takes a look at the bear perspective on Facebook (META -1.19%). Facebook, like several other companies in what some might call the "Web 2.0 Bubble," such as Groupon (GRPN 2.97%) or Zynga (ZNGA) went public with a fanfare of excitement about its new, potentially disruptive business model. But it hasn't returned the revenue investors were hoping for, and shares plummeted as a result. Andrew also notes that Facebook, amazingly, may be facing some market saturation in many countries, where new user signups are slowing significantly.