Chairman Bostock departs in shakeup aimed at spurring turnaround.

Chairman Bostock departs in shakeup aimed at spurring turnaround.

Social networking company cites $3.7 bln in 2011 sales.

Social networking company cites $3.7 bln in 2011 sales.

Yahoo may pursue buyers for its stakes in Alibaba and Yahoo Japan.

Yahoo may pursue buyers for its stakes in Alibaba and Yahoo Japan.

Deal would value networking site at more than $100 bln.