Full Crossplay Support Comes to PS4 Starting With 'Fortnite

The open beta allows crossplay, progression, and commerce across the PS4, Android, iOS, Nintendo Switch, Xbox One, PC, and Mac platforms. 

Sony's Cross-Platform Lockout in Fortnite is Bad for Everybody, by Jared Lee, SUPERJUMP

Fortnite' cross-play comes to PlayStation. This is huge.

PlayStation chief on why Sony took so long to enable console cross-play

Sony is blocking Fortnite cross-play between PS4 and Nintendo Switch players - The Verge

Fortnite is Headed to Next-Gen Consoles

Fortnite Mobile' Is Coming To iOS, Will Feature PS4, PC Cross Play

Step-By-Step: How To Do Cross-Play With iOS, Xbox One, PS4 And PC In ' Fortnite Battle Royale

Fortnite coming to iPhones and Android devices - CNET

Sony Gets With the Times, Adds PS4 Cross-Play Support for 'Fortnite

Sony grants Fortnite PS4 cross-play, gives in to cross-platform gaming - MySmartPrice

Epic Accidentally Allows Xbox And PS4 Cross-Play In Fortnite, Disables It

An Epic cross-play journey: Paragon, Fortnite, and what comes next - Epic Online Services