Before I get to my stats, though, I have one more tip to share. When writing the tweet that will be shared, NEVER write it in first person. Always use third. I've had a few TC tweets where I got friends congratulating me over a release that wasn't mine because the message was similar to "My new book is here!" This is important because, as I personally demonstrated, people trust the message you've written and may not read it before supporting. TC is very much an "I'll scratch your back if you scratch mine." (Which is why I recommend varying your messages to be less spammy.)
Anyways, on to the stats.