Web traffic analytics firm Experian Hitwise reports that Facebook was the most visited website in the U.S. during the week ending March 13, surpassing Google in what has become an increasingly frequent occurrence in recent months.

So Facebook is now the #1 most visited website. Well, that may be true, but for internet marketing purposes, many people on Facebook are still just playing games and catching up with their pals. They aren't necessarily in the "buying" mood. So it might be difficult (actually it IS difficult - I've tested this to a limited extent) to market stuff on Facebook.

Think about it... if you are actively looking to buy something (whether offline or online), do you visit Facebook or Google?