Go Fucking Work - Website blocker so you can get back to your fucking work
Block Together - A useful tool which helps you block trolls on Twitter.
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Secateur - Use Secateur if you want to temporarily or permanently block or mute (or both block and mute) a Twitter account and all its followers.
Block Facebook - Chrome Extension that protects your privacy by blocking FB
WebPurify - Profanity Filter, Image Moderation and Video Moderation Services Made Easy.