Probably the most unknown area I read and/or hear about today are private G+ circles. For example, much pre-publication PL/compilers work is mentioned in "limit

Probably the most unknown area I read and/or hear about today are private G+ circles. For example, much pre-publication PL/compilers work is mentioned in "limited" posts. I've heard similar things are happening in ML areas, though I have no personal insight into them.