Facebook LIKE doesn't work because domain is banned by Facebook

Dear all,

I recently post a support ticket regarding the Facebook Like Reset to ZERO –

https://premium.wpmudev.org/forums/topic/facebook-like-reset-to-zero#post-229012

Initially I thought it is the plugin issue, but WPMUDEV mentioned that my domain is somehow “BANNED” by Facebook.

Do you know how do I verify this and report to Facebook for such issues?