Struggling Groupon ousts CEO Andrew Mason (Update)

Struggling online deals pioneer Groupon has ousted its quirky founder and CEO Andrew Mason amid worries that people are tiring of the myriad of online restaurant, spa and Botox deals that Groupon built its business on.

Twitter sinks to new low as 'lockup' expires

Twitter shares plunged to new lows Tuesday, under pressure after the expiration of the so-called lockup period, which banned sales by company insiders after its public offering.

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