It’s official: Biz Stone, co-founder of Twitter, has announced that Twitter is gearing up to start charging businesses for business use of Twitter through a premium Twitter service.

Twitter co-founder Biz Stone has confirmed that Twitter will begin the beta roll-out of a new Twitter service – the Twitter verified account service – designed to confirm and verify that the Twitter accounts of celebrities, public personalities, and other famous people are actually the accounts of the people they say they are, and not imposters and pretenders.