In its attempt to bring social streams into the enterprise, Salesforce is taking its Chatter messaging service and making it freemium. Unlike most freemium services which start out free, and then add on premium features for a price, Salesforce is going in the opposite direction. Chatter started out as an additional $15/user/month service, but perhaps the uptake wasn't what CEO Marc Benioff had hoped it would be. Now most of the basic features will