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Twitter’s chief scientist Abdur Chowdhury has left the microblogging empire. Chowdhury confirmed his exit in a tweet with a Hitchhikers Guide to the Galaxy salute.

Chowdhury was the architect behind Twitter’s search and recommendations features.

He originally joined the company 2008 after Twitter acquired his start-up, Twitter-search site Summize, for US$15 million. Prior to his start-up foray he was chief architect of search product at AOL.

Meanwhile two of Twitter's earliest investors and board members, Fred Wilson and Bijan Sabet, announced on Friday that they were stepping down.

Twitter issued a statement saying "both saw what Twitter could become before most anyone else. We look forward to their continued input as both investors in the company and passionate users of the product."

The board departures come fresh from the recently completed $800 million funding round, half of which went to cash out some of the holdings of early investors, including Wilson's firm, Union Square Ventures. ®

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