Don't guess. Hashtag stats as you type - everywhere!
Twitter Lists Redux is a Chrome extension to help you make more effective use of Twitter using Lists.
Normally, Twitter Lists are hidden and awkward to use, but Lists Redux brings them out front so you can access them from your sidebar and add people to lists from their hover card.
For Facebook, Twitter, Pinterest, LinkedIn, Google+ ...etc.
Better TweetDeck is a browser extension allowing you to improve your experience on TweetDeck.
See thumbnails from more than 25+ websites, add emojis to your tweets, improve the UI of TweetDeck, use regexes to filter tweets, and so much more.