Exclusive |verified| - Shinseki No Ko To O Tomari Dakara De Na Facebook

You won't find this officially labeled as a "Facebook Exclusive" on any corporate roadmap. Instead, the term refers to how the series is being consumed and shared:

「これ、Facebookに上げていい？」 shinseki no ko to o tomari dakara de na facebook exclusive

It falls under the "Shota" category (involving a younger male protagonist) and adult romance. You won't find this officially labeled as a