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I would think that the users indentified as 'Players' are people that are playing Candy Crush Saga, but haven't created any kind of account.
When I first playing CCS I just downloaded the App and started playing. Every time I played I got a reminder to create an account so that my game could be saved.
Until I created an account I was just displayed as 'me' on all the game event boards, and I imagine in this case I would have been shown as a 'player' to everyone else.