Some numbers here (http://www.crunchbase.com/company/chesspark) and some comment there (http://www.chess.com/forum/view/general/chess-park-was-a-better-service).
See also this (http://www.techcrunch.com/2009/12/22/chesspark-chess-com-merger/) and that (http://209.85.229.132/search?q=cache:kuMpJcOdMI8J:www.chesspark.com/+chesspark&cd=1&hl=en&ct=clnk&gl=uk).
What was chesspark like ? How many members did they have ? and how long have they been running for ? Sorry to hear that is has been closed down but on the other hand welcome to chess.com hope you will enjoy your stay here.