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Help with the fact that, given how short twitter posts are, it is very difficult to talk about stuff at comfortable length. There isn't even the comfort of a linear or tree structure like in fora or reddits, and while you can stack them by topic you need to sacrifice characters to do so. You can link to longer posts in blogs and fora, but then why not talk there? Also, every time you post a link, it has to be tinyfied, which is a pain in the neck. And the briefness of the format forces to rely on tacit understanding and common priors, which oftentimes aren't there, so the risk of illusion of double transparency is very high. .
I have never been on a Lesswrong meetup because they tend to take place too far away from my range in terms of distance and budget. Because of that, I don't know if those perform this function to everyone's satisfaction in such a way that what I'm suggesting here doesn't seem worth the effort. I hear that they're a lot of fun, and involve quite a bit of silliness, though; I find those cruelly lacking on Lesswrong proper, whether it be in main posts or discussion posts, and their relevant threads.
That's why I think it would be nice to have a forum, a place to have normal discussions, where you don't have to watch that you don't say anything stupid or out-of-line lest you unexpectedly lose karma. A place to exchange jokes, frivolities, and entertainment. A place to talk about stuff that isn't rationality or singularity-related. A place to relax and enjoy the company of like-minded folks. A place to take a more personal approach to communication, with sequential rather than branching conversations. A place to make and be friends.
Don't you think having that would be nice?
EDIT: Also, if this place does already exist and I'm not aware of it, I humbly request that you provide me a link, for which I would be most grateful.