I've had a quick dig around and it was useful to see, from twitter's perspective, what was a good tweet, or not. Some that were good were a surprise, and some that I thought were good seemed to fall on deaf ears. Of course, thouse with experience of analytics will already know that there are many other factors which affect performance of a message.

Twitter has quietly opened up its various analytics tools to the public, giving everyone access to in-depth data about the people and brands who follow them, as well as the performance of their most recent tweets.

Twitter Opens Up Its Analytics Tools For All Users [thenextweb.com]

Users simply need to head to the Twitter Ads dashboard and click on the ‘Analytics’ tab at the top of the page to access the new features.