For the folks having trouble finding the official GW pages:

Warhammer 40,000
[url]https://www.facebook.com/Warhammer-40000-1575682476085719/[/url]

Age of Sigmar
[url]https://www.facebook.com/GWWarhammerAgeofSigmar/[/url]

Forge World
[url]https://www.facebook.com/ForgeWorldUK/[/url]

Black Library
[url]https://www.facebook.com/theblacklibrary/[/url]