Give them a reason to

Users might submit a review without having to ask for it, but it sure helps to ask! Even better, give them an incentive, such as the chance to win something. 

 

Warning

You’ll have to check what your local laws stipulate, but from what I understand they have to be able to participate in the contest no matter how good their review is (even if it’s a 1-star review).

 

EXAMPLES