A collection of custom CSS for the Stylus extension.
These styles are also on userstyles.org:
Remove comments, social media links, suggestions, number of likes. Maximize Stories list.
Some styles for Old Reader
Hides scores (upvotes), hides the voting button on archived posts -which you can't vote on anyways-, hides the awardings bar (Platinum, Gold and Silver indicators), and hides some useless features when you're not logged in.
Hides trivia, extra details, "My activity", a bunch of buttons, reviews from people you don't follow, and a couple things more.
Hides a bunch of stats and other drugs.
Hides view, comment, subscriber, likes and dislikes counts on Youtube.