Hi guys! Relatively new here, so I hope I'll get some good advice. I've been reading you for quite some time now. I'm trying to do a contest on my webpage and social media. The idea is to get users to enter as many emails as possible (of their friends) to win bigger prize. Let's say, if they enter 5 emails, they get a very small prize, if they enter 10 mails, bigger prize, and for 40 mails the biggest prize. How can I do that? Is there an app for that? Like Wishpond, Woobox, etc? So I could post it on my website and FB. Thank you for all your answers.