Awesome update to Twitter retweets!More room for comments and it notifies the person you're retweeting without taking up any characters
How to use quote Tweet to add your own comments:From Web
Hover over a Tweet.
Click the Retweet icon.
A pop-up will show you the Tweet and a comment box.
Type your own comments in the Add a comment field.
Click the Tweet button.
The Tweet will then be shared with your followers as a quote Tweet!From mobile apps
Tap the Retweet icon.
Tap Quote Tweet.
Add a comment and tap Tweet.
The Tweet will then be shared with your followers as a quote Tweet!#twitter #twittertips