Guidelines for Contests on Twitter
Although it may seem overwhelming, Twitter's Guidelines for Contests are pretty simple.
Here is a brief rundown of the most relevant points:
Discourage the creation of multiple accounts
If users make lots of accounts in order to enter a contest more than once, they’re liable to get all of their accounts suspended. Please be sure to include a rule stating that anyone found using multiple accounts to enter will be ineligible.
Discourage posting the same Tweet repeatedly
Posting duplicate, or near duplicate, updates or links is a violation of the Twitter Rules and jeopardizes search quality. Please don’t set rules to encourage lots of duplicate updates (like saying, “whoever retweets this the most wins”). Your contest or sweepstakes could cause users to be automatically filtered out of Twitter’s search. Plus, instead of their followers seeing your cool contest or sweepstakes, their followers might start getting annoyed by your contest. You might want to set a clear contest rule stating that multiple entries in a single day will not be accepted.
Encourage the use of topics relevant to the contest
You might decide to have users include relevant hashtag topics along with the updates (like #contest or #yourcompanyname). Keep in mind that hashtag topics need to be relevant to the update; encouraging users to add your hashtag to totally unrelated updates might cause them to violate the Twitter Rules.
Check out Wishpond’s Twitter Campaigns to boost your ROI from Twitter using contests and promotions: