This question already has an answer here:
How about making something like chitchat.stackexchange.com where people would not have to necessarily ask questions but be more like a regular forum format to discuss things.
There could still be up/down votes but does not have to be a "best answers" feature.
Right now it's hard to start off-topic discussion as it is quickly killed by moderators and worst off you get a few down votes for something like that and lose reputation points.
I think many people sometimes want to just hang out and talk to other members of this site, maybe to share ideas or say something, but not necessarily in a form of a question.
I know there is a chat, but chat is something real-time. In chat you limited to talking to people who are already there in that chatroom with you at the same time. What if a want to post a topic and then check responses the next day and the next day....