Snapchat Actions
Ask entrants to follow you on Snapchat and share their username.
Snapchat doesn't have an API for checking follows, so entrants follow you and then enter their Snapchat username.
Add your Snapchat Username and upload your Snapcode (5MB max) so entrants can scan it. You can get your Snapcode from the Snapchat site.
Here's what entrants see after they tap the link on their phone:
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SoundCloud Actions
Reward entrants for following you, listening to, liking or reposting your tracks on SoundCloud, or submitting their own.