You must not incentivize people to use social plugins or to like a Page. This includes offering rewards, or gating apps or app content based on whether or not a person has liked a Page. It remains acceptable to incentivize people to login to your app, checkin at a place or enter a promotion on your app’s Page. To ensure quality connections and help businesses reach the people who matter to them, we want people to like Pages because they want to connect and hear from the business, not because of artificial incentives. We believe this update will benefit people and advertisers alike.Facebook platform’s policy
In its quest to foster organic, meaningful interactions within its community, sharing or tagging content is something Facebook users are encouraged to do of their own volition, not because they’ve been bribed.
In Facebook’s Page Groups and Events Policies, rule number three, under “Administration of a Promotion” states:
Personal Timelines and friend connections must not be used to administer promotions (ex: “share on your Timeline to enter” or “share on your friend’s Timeline to get additional entries,” and “tag your friends in this post to enter” are not permitted).
As you can see, Facebook prohibits rewarding participants for sharing your contest or giveaway on their own Timeline, on a friend’s Timeline, or even by tagging someone.
❌ Don’t incentivize people to post content on Facebook, or give the impression that posting to Facebook will be rewarded. For example, don’t give people anything in exchange for them posting to Facebook (i.e. don’t give or promise virtual goods, achievements, coupons, discounts, access to content or extra entries in a promotion, if they post content to Facebook).
❌ Don’t incentivize people to like a Page, or give the impression that liking a Page will be rewarded. See the examples below.
✅ Incentivize or reward people for using Facebook to login to your app.
✅ Incentivize or reward people for checking into your location.
✅ Use referral based rewards to help bring awareness and reengagement with your game. For example, you can give free in-game items or offer discounts on game items for every friend that installs your game through a person’s post.