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Well, maybe Rational_Brony wants to find posts with detailed explanation of some position/fact with a summary of corroborating evidence.
I'm a wordy person who likes to take it slow and read things leisurely
I treat that as preference for 1k-ish posts over ≤140-character posts.
On many forums posting a medium-length essay without too much polishing would be just "business as usual", on some other it would be "weird but OK". On Twitter it is declared impossible if you use it as supposed. You could use Twitter as an RSS-like stream for ...
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.