The fact that you can make money by posting ads in your app without any payment from users! And also it's really easy because of their simple interface which makes everything very clear even if I know nothing about programming or marketing activities! Also there are no restrictions when making posts so everyone who wants to earn with them can use them as much or little as he/she needs (I would appreciate more promotions like "boosting up" my post). You don't need too many friends or followers but just follow others will be enough. It works perfect at first. But after some time you'll see that most people won't promote your ad unless you have 10+ follower limit seted - maybe not all? So now i am working hard again promoting myself through other means.
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