BlackBerry Announces Twitter T-Shirt Giveaway Research In Motion's latest Twitter marketing offer was a t-shirt giveaway for their UK followers. Every 10th person to follow the BlackBerry Twitter Account and retweet the following message won this shirt:

Follow us & RT this tweet by 5pm GMT for your chance to win a BBM T-shirt! Every 10th tweet wins! (UK ONLY) #BBMT4MeUK

In a few hours, their original tweets and hashtag received over 450 retweets! Since twitter shows 100+ instead of the exact number of retweets, its likely they actually received thousands of RT's.

BlackBerry's Tweet received 450+ retweets
Furthermore, this promotion spread deep into friends of friends of followers through 3+ levels of retweeting.

To build additional excitement, follow up tweets were posted every few minutes during the contest announcing the latest winners. There were 56 winners announced before the promotion ended a few hours after it started:

BlackBerry Announcing Twitter T-Shirt Giveaway Winners

I'm curious how they collected 50+ mailing addresses and shirt sizes through direct messages. Generally DM's dont work too well because BlackBerry needs to be following the winner before the winner can send a DM to BlackBerry. With a limit of 140 characters per DM, any back-and-forth questions, incomplete addresses, or missing shirt sizes can be a nightmare. Handling the data collection through a structured form (with validation) or at a minimum via email would be much easier. Having traditional contact info on file in case of a delivery issue or problem is always a good idea too.

All in all, a great social media promotion. Congrats BlackBerry!