The front page contains hot questions from many sites.
However, some sites I am not interested in and I want to permanently blacklist them. Can this feature be added (unless it is already present, in which case please tell me how to use it)?
Note that I do not want to limit my attention to sites I already know about (i.e. subscription is not an answer).
For example, I am interested in Lisp. SE has several sites which have Lisp questions: StackOverflow, Emacs.SE, CodeReview.SE, Programmers.SE &c (not to mention all the platform-specific sites like Unix.SE and Apple.SE which also have Lisp-related questions). This means that white-listing is not an option. However, there are now the Japanese-language Ja.SE and Portugese-language Pt.SE, and I understand neither and I don't want to ever see anything related to those sites. This makes black-listing imperative.