Is anyone else doing this on Twitter??
You include '#PullACracker' in your tweet and if someone retweets it, then they're essentially agreeing to 'pull a cracker with you'. Tesco then send you a link and it shows a little animation of you and the retweeter pulling a cracker. The winner gets a prize :)
I'm such a geek, had so much fun. thrilled with the 2 free lindt chocolate bars too