Don't skimp on this step. Really consider what will excite your followers and be sure they know it's exclusive to Twitter. To get people personally invested in your success, ask for their suggestions.
Start tweeting about when the campaign will launch. Follow up with frequent countdowns and campaign mentions (including hashtags and Retweets) to gain visibility and boost excitement.
Tweet the campaign specifics with instructions on how to earn the incentive. This message will be distributed widely, so be sure it's clear. Fuel your campaign with progress Tweets in real time, telling followers when they're close to reaching the goal.
When they reach the set number of Retweets, give your followers their well-deserved reward. You can embed the content into the Tweet itself or use a link to drive them to your website.
Good work! Your campaign increased your visibility. Now, keep that momentum going. Follow up with intriguing Tweets or retweet positive conversations from your campaign.