Is There Follow Gating For Twitter?

If your Twitter campaign is using "Require Email Address & Twitter Account Login" (as shown below) then anyone who enters your campaign will become an automatic follower. 

 

There is no "gate" blocking people from seeing your campaign in order to enter (i.e. Facebook Like-Gating) but this feature requires all participants that enter to click "Authorize App" to enter and that makes them an automatic follower.