Chess.com total players

Hi,

Chess.com currently states that there are 89,900 players.  Is this 'active' players or is this a count of any and all players that have ever logged on this site?

I would like to have a better understanding of what a 50% percentile ranking means at this site.  In other words, does a 50% percentile ranking mean you are in the middle of the current active players or just anyone that has ever played a game on this site?

Watch your back rank.

The list you are referring to is active members who are regularly playing games on the website.

Thanks guys, both responses were helpful.

http://www.chess.com/livechess/players.html?type=Bullet

Can anyone give a reason why the bullet graph does not have the standard distribution if the others?