How to block all Apple-related news?

Add to or replace the filter string at http://diff.biz/

Call me stupid but you could just avoid clicking on the links.

I need this for Twitter as well.

For twitter you can install Tweetbot on the Mac, it has a filter option for names, and content. For the browser you can probably do the same via a greasemonkey script. Personally I think you can also learn self-control, and not look for titles with Apple related content in it, and if still found, skip it. I have no problem doing this with Windows related content i.e. Best of luck!