Not easy. But Twitter and Linkedin may be one way to go if you left the Academic world already. Follow the influencer in this space. Of course, you will also receive personal and corporate self-promotion as well. But there is no easy way for now. And then Andrej Karpathy has this tool. http://www.arxiv-sanity.com/ Once a while, some people will post what are the important papers for the major conference also.