There are questions here about whether to spread the word about the site through social media, how to spread that word, and finally improving our presense on Twitter and taking control of the AskUbuntu Twitter account.
From Marco's answer and jrg's comment to this question, the AskUbuntu Twitter account is a bot.
However, none of the above questions seem to talk about when does the Twitter account actually tweet a question? I'm curious. What are all the conditions that the account tweets a question? After how many views? Or votes? I know that it tweets after a bounty is placed.
Example: this question was tweeted; it currently has 76 views, 3 upvotes and 4 answers of which one has 9 upvotes. What triggered the tweet?