Twitter going to make money from Business

Recently Twitter co founder Biz Stone said that twitter will be going to make money from Business in the upcoming days.Twitter is not at all using ads and all or any other revenue generating sources like affiliates or something.Buy out is a nice option.Biz Stone says that twitter will remain free for all the users ,but it will be generating income through some business,it sounded like some business subscription service.Whether Google buys twitter or not? is the another generating question .Anyways withing 6 months we can know the future plans and updates of twitter,or whether twitter replaces orkut or not.
Biz Stone words stress that there are new future hopes from twitter