Major leadership changes Twitter renewed questions about its business prospects — was the replacement of CEO Jack Dorsey by fellow co-founder Evan Williams a shuffling of deck chairs on the Titanic? But VC backers of the microblogging service interviewed by wired.com insisted they remain bullish, and Bijan Sabet, a general partner at Twitter backer Spark Capital, revealed that new revenue models will be unveiled in the first half of next year.

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