| http://www.w3.org/ns/prov#value | - Now, a Wall Street Journal report quotes Twitter co-founder Biz Stone, who says the company recently hired a product manager to oversee the development of premium services -- that is, extra features that companies or other users would need to pay for.So far, the only sign of anyone giving money to Twitter was the recent debut of ExectTweets, a Microsoft-sponsored site that aggregates messages from
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