Well, so far, I can't send them the info they requested (name, date of birth, mailing address), because they haven't followed me back. The way Twitter Direct Messages work, you can't send one to someone unless they follow you. I get that error when I attempt to send them my info. I'm NOT putting the info into the PUBLIC timeline, because of the possibility of trolls.
Same thing happened last year. I had "won" a book from @nationallampoon about the making of "Animal House". Got an email notification of the Direct Message, but THEY ALSO didn't follow me so I could send them my information, so I never got the book. Guessing this will turn out the same way.
Companies that have "giveaways" on Twitter need to freggin' learn HOW TWITTER WORKS!!!
UPDATE: Apparently I'm not the ONLY one...