This particular way of counting traffic will not include data from Tumblr, which happens to be a company that Yahoo picked up earlier this year for a cool $1 billion, and I would assume if it did, Yahoo would have “won” by a larger margin. I guess it is a good place to signal that Marissa Mayer’s tenure as the company’s CEO is starting to bear fruit, and it has also been reflected in Yahoo’s share price which has nearly doubled in value ever since she helmed the once ailing Internet company. Other than Yahoo and Google, which are the remaining companies that would make up the most visited Web properties? They are Microsoft, Facebook and AOL. Having said that, getting to the top is the easy part compared to staying there.