Party Hub is a part of the Mobile App of Fortnite: Battle Royale. There are a variety of things you can do in Party Hub while not in game. Party Hub was introduced in Update v10.30.
After Update v16.00, Support for Party Hub was dropped, removing the feature all together. This caused players to lose their avatars in-game.
On iOS, trying to use the Party Hub will now show a error saying that it is “temporarily” unavailable.
Get in a Party With Friends While Not In Game[]
In Party Hub, you can chat with friends that are in-game or on the app. In the Lobby it will show that you are "Just Chatting". You can also mute others in the party and join in-game to play with them.
Change Icon[]
In Party Hub you can also change your in-game icon. This will display on the friends tab. It displays all owned Outfits, Recruit Outfits and Default Save the World Characters.
Add Friends[]
On Party Hub, you also have the ability to add your friends.
View the Item Shop[]
You can view the current Item Shop while in the Party Hub. You cannot purchase any cosmetics, but can only view them. Their price, rarities, name and icon will all be displayed.