Main idea:
Login with your Facebook account, choose your opponent and let your and his friends make mega-battle
Here is first video:
Dynamic texture material loading
Dynamic texture code UE4_FacebookArena/AvatarPaperSpriteActor.cpp at b28d98f75206d5e14f5df1d33ce633789cf0e985 · Batname/UE4_FacebookArena · GitHub
GitHub repo GitHub - Batname/UE4_FacebookArena