Get a grip
Be clear about what it is you want from your campaign, ultimately it still goes back to keyword(s) and research + communication. When you are clear in your own mind what words you want to communicate you are half the way there. That word (Twitter username) needs to form part of your customized Twitter URL such as twitter.com/seoherts or twitter.com/nextgenseo. This allows for the creation of a static address for googles index. Get a grip on your username: short and succinct equals tweetable.