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facebook.com
In short: Facebook (facebook.com) accepts page/group post. It is free + paid tier to submit, takes a moderate amount of preparation, and scores 43/100 on our impact ranking (long tail).
Create page and share in relevant groups if allowed.
Group rules strict; avoid self-promo spam.
Priority is later, which sets the band. It is free + paid tier and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.