2 of 2 replaced http://wordpress.stackexchange.com/ with https://wordpress.stackexchange.com/

What determines whether or not a question is tweeted?

Out of sheer curiosity, I am wondering about the WordPress Answers Twitter account. What determines whether a question gets tweeted or not? I see that a tweet goes out roughly once every three hours. I thought maybe it tweets highly rated questions without answers, or maybe questions with a lot of activity, but this question, with a score of only 1, was tweeted 8 hours after the answer (also a score of 1) was accepted.