Well, not yet. But they will in 2010 when Salesforce Chatter comes out.
And so will any other object - you'll be able to turn Accounts, Contacts, Campaigns, custom objects, etc into chatterboxes.
There is a lot of mixed reviews about the recently announced Salesforce Chatter. Some are wondering why would you need Chatter in the world of twitter and facebook.
I got a chance to talk to the a developer on the Chatter team at Dreamforce and walked through the application.
The way I make sense of it is that each record in salesforce can have its own "wall" like in facebook. You will be able to configure fields (up to 20, just like history tracking) in the record to publish to its own wall when criteria you set is met. So for example an opportunity can have a wall where different users can post comments (nice.! even by itself) and also intermingle with system generated wall posts that make sense. So a team can be collaborating on a deal by posting information to the deals wall, and at the same time the deal itself can intelligently participate in the conversation by posting to its own wall.
I think its neat, and can think of a lot of uses for it in records that require collaboration (bugs, requirements, user stories, opportunities, quotes, etc.).
Even now, I have really abandoned email in requirements elicitation and sfdc implementation management - both my customers and developers post comments into Ideas to collaborate. Chatter will replace that in a much more context sensitive and useful manner.
Integrate Google Wave, use Salesforce Chatter, and you'll be able to get everyone collaborating an order of magnitude more productively than you can via email.
I'll blog more specifically about it when the developer preview becomes available next year.
