Unfortunately, if enough people mark a post as spam or block a post from their News Feed, and that post contains a link like the one you've sent, Facebook will block third party applications from sending posts containing that link or anything similar. 

For more on Facebook's reasoning, please see this blog post: https://www.facebook.com/help/116393198446749

Facebook released new guidlines for sharing content on their platform. Please make sure you’re following them https://www.facebook.com/communitystandards/ 

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