The fans of this Jack (whom I've never heard of) probably won't have much worth stealing. What you want to do is persuade them to get account numbers and PINs of their parents. They'd probably do it for something trivial in return, like a signed photo or, as stated, a personalized message in social media.
And why was the password required anyway? If you have less than 50 followers on Twitter, which I assume would be the case for most people, then any mention of your @accountname stands out. Although there is a risk of missing something if you assume, like I do, that any mention is spam because they usually are.