Metafilter. (Hands down one of the best forums with quality conversations.) Other than that, the usual suspects: Reddit, Vox, Quartz, WaPo, New Yorker, The Atl

Metafilter. (Hands down one of the best forums with quality conversations.) Other than that, the usual suspects: Reddit, Vox, Quartz, WaPo, New Yorker, The Atlantic and NYT.