Can I Block Someone on Facebook and Still Send Them a Message? | Techwalla
Don't block a Facebook user unless you are prepared to lose the ability to reach out to her--including through Facebook's messaging service. Because the point of blocking is to make users invisible to each other on the site, you cannot exchange private messages with a user you have placed on your blocked list.
You cannot message someone you have blocked on Facebook. Don't block a Facebook user unless you are prepared to lose the ability to reach out to her-- ...