it was possible to get free Fortnite skins by subscribing to Twitch Prime. However, this is no longer possible. Additionally, there have been three Refer-A-Friend events, but none of them are available at the moment.
That method is easy. All you need to do is drop into the official creative map. This automatically ties your viewing to your Epic account and makes it easy to get the FNCS Invitational rewards. This has the added benefit of having a full viewing experience with other Fortnite fans. These ...