NEW YORK (

TheStreet

) --

Sony

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said on Wednesdaythat it had discovered a data breach in its Canadian mobile phone subsidiary. The new attack comes as Sony

struggles to recover from earlier attacks that may have compromised

personal information of more than 100 million users on its Playstation Network.

Microsoft

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CEO Steve Ballmer should be replaced, influential hedge fund manager David Einhorn of Greenlight Capital said on Wednesday at an investor conference. Ballmer's presence continues to be the "biggest overhang" on Microsoft's stock, Einhorn said.

Shares of Microsoft rose 0.6% in premarket trading on Thursday.

Twitter

officially announced on Wednesday that it had acquired

Tweetdeck

, which organizes Twitter feeds. The deal was valued at around $40 million, according to reports.

Social gaming company

Kabam

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has raised $85 million in venture funding led by

Google

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Ventures and Pinnacle Ventures. The company makes online games for

Facebook

that are targeted at hardcore gamers.

Music sharing start-up

Spotify

is rumored to be in discussions to integrate its service into the Facebook platform in Europe. The partnership is another indicator that Facebook is moving more towards becoming a music and media hub. The social networking giant announced a deal with

Warner Bros.

in March to stream the studio's movies through its platform.

--Written by Olivia Oran in New York.

>To follow the writer on Twitter, go to

http://twitter.com/Ozoran

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