Like-gating is a big part of Facebook Contests.
How is “Follow-Gating” done in Twitter Contests?
It is very simple: All entrants must follow a brand’s Twitter account to enter contests on their Twitter profile pages. It is a simple permission we ask for. The follow is automatically made upon entry via Twitter Connect.
It is easier than Like-Gating on Facebook. A Like-Gate is an image with text telling users who don’t Like your Facebook Page that they need to like it to access the current contest. On Twitter, this step is unnecessary and will significantly reduce the drop-off rate of your contests. Sticking to just Follow-Gating for Twitter Contests is strongly recommended.
Check out Wishpond’s Twitter contests to boost your ROI from Twitter using contests and promotions: