ESPN compiled a list of the most famous athletes in the world taking into account several different factors. They took into account Earnings, Endorsement Deals, Facebook/Twitter Followers, as well as google search results.
http://espn.go.com/espn/feature/story/_/id/15685581/espn-world-fame-100
A Couple Interesting Tidbits...
-The top 10 is comprised of 4 Soccer Players, 2 NBA players, 2 Tennis Players, 1 golfer and 1 Cricket player
-The first American Football player isn't listed until 32 (Cam Newton)
-7 Females made the list (Sharapova first at 18)
- Basketball had the most members of the list with 20 of 100
-Don't think market plays a role in being "Famous?" Amare Soudemire and Deron Williams somehow make this list ahead of guys like Tim Duncan and Ben Roethlisberger
- I've never heard of 14 of these people... Probably because I'm your typical "HEY LETS WATCH THE WORLD CUP! USA! USA!" Soccer fan
How many on the list have you never heard of??