Future of microblogging? Corporate Twitter, geo-tagging?

In a move that appears to signal an attempt by Twitter to finally monetize its user base, the company will start selling corporate accounts to brands by the end 2009.

Though Twitter co-founder Biz Stone had hinted at such an initiative earlier this year, he fleshed out the concept this week at an industry event in London, where he said a pay-for package will offer verified streams and analytics.