The problem is, there are way too much papers, even if you focus already to some domain, like deep learning. But this seems to be completely open to any topic? For machine learning, https://www.reddit.com/r/MachineLearning/ is currently a good place, or Twitter and following some of the authors you are interested in, or just set some Google Scholar alerts.
Keeping it broad by allowing any topic but raising the bar to require a peer reviewed paper might even decrease the velocity of conversation, allowing better quality conversation. That is, if the lower velocity can allow a community to form still