I believe that's a relic of the Carlsen vs the world match.
Magnus Carlsen on chess.com
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http://www.chess.com/members/view/MagnusCarlsen
So, I was searching for the top players on chess.com just out of curiosity, and I noticed a number of famous people whom I never knew played on chess.com.
A few notable ones were:
Magnus Carlsen
Hikaru Nakamura
Judit Polgar
Just thought I'd let you guys know...