I believe somebody has to call it. If you press draw after threefold repetition it should automatically end the game.
BUG: chess.com does not detect draw by repeated moves
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still a bug
UCSF Rule: you must claim a draw by repetition
Similar: http://www.chess.com/forum/view/suggestions/draw-by-repetition-doesnt-initiate-in-live-chess
OK just confusing some sites have it automatic.
repeated move like 6 times still no draw... hilarious
http://www.chess.com/livechess/game?id=651281529