No matter how many times someone has asked for this over the last six years of HubPages, the idea has never gotten off the ground.
HubPages (admin) feels there's no need to re-invent the wheel when so many chat services exist out there. They tell people they can go chat with other Hub users wherever they want.
Then there's the people who have tried to get HubPages-oriented chats going somewhere. Ever single one has failed/died off quickly due to a total and complete lack of participation.