Season 4 reviews
These are mostly spoiler-free. Dec 29. Second one includes synopsis and trailers.
'Black Mirror' Season 4: TV Review https://www.hollywoodreporter.com/review/black-mirror-season-4-review-1065805
Black Mirror season 4 review: There's not a single duff episode in Netflix's latest Charlie Brooker series
http://www.digitalspy.com/tv/black-mirror/review/a845174/black-mirror-season-4-review/