Rather than expecting an instant convert to a customer which only happens if your product or service is perceived as low risk and no long term commitments.
How about engaging and nurturing your potential customers rather than immediately try to convert them to be a customer? You may have heard the 7x touch points in building customer relationships and social media channels excel in helping you achieve your engagement and brand relationship building.
Develop your Facebook advertisement campaign with engagement in mind with an activity that is fun rewarding and supporting of your business growth?
Here is an example from Seed Greek Kouzina:
"Only 11 days remaining to submit your own photo and/or to vote for your preferred photo of Greek food and cuisine!"
Win a dinner for 4 to the value of $200
Contest period 1/08/2017 - 24/08/2017
Contestants are invited to submit photos of Greek food dishes (limit of one per day) and to encourage their family and friends to vote (one vote per person) on their preferred photo image. The winner will be based on the Greek dish photo image with the most popular votes after the contest period. The winner will be announced on the 25th August 2017"
Visit - https://www.facebook.com/SeedCuisine/app/451684954848385 or http://woobox.com/joqnzw