How to Run a Successful Instagram Contest or Giveaway : Social Media Examiner
For example, if you run a contest and say, “Post a photo to Instagram and we’ll pick our favorite as the winner,” that indicates some sort of judging is going into that determination. You want to make it clear that you’re running a contest.
In your post promoting the contest, include the word contest or giveaway on the actual image. In the first sentence or even the first word of the caption, say “contest” or “giveaway” and use emojis and capital letters. Make it clear and obvious that this isn’t an ordinary post.
To set up and run your own Instagram contest, read the article below for an easy walkthrough or watch this video: