Summary Box: Chairman, 3 others out at Yahoo board

: Yahoo Chairman Roy Bostock and three longtime board members are stepping down.

THE IMPETUS: Many frustrated shareholders blame them for not fixing the problems dragging down the Internet company's revenue and stock price. The shake-up comes shortly after Yahoo got a new CEO and co-founder Jerry Yang left the board.

CLEAN SLATE: Bostock says bringing in new directors will provide Yahoo with needed expertise and perspective for a turnaround. With the housecleaning, Yahoo will be left with seven directors, all of whom have joined the board since the end of 2009.

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