Detox for Facebook - Replace your Facebook feed with PH, HN, DN and more.
Refined Twitter - A browser extension that improves the Twitter experience
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
FriendFilter - Auto unfriend tool for Facebook
ilo - Premium Twitter analytics