Very interesting. I wonder when exactly they overtook the top spot. Of course this probably just means that more of the online marketers are using facebook now and not Google as much. I'd think Google would still be the most visited site overall.
That's really interesting, though, I'm not really surprised. Facebook's traffic is enormous, the website's security is bulletproof and they have tons of backlinks, not to mention the content, haha.
I have to say that I agree 100%. It makes sense. Facebook has over 1 billion active users - that is over 14.3% of the total world population. No other Website or company can claim to have this many users/customers.