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-platform crossplay guide for PC, PS4, Xbox One, Switch, Mac and mobile - Polygon

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

Cross-platform play - Wikipedia

Epic Games Thinks PS4 And Xbox One Will Be Able To Play 'Fortnite Battle Royale' Together

Sony Finally Gives In And Allows Fortnite Cross-Play Between PS4, Switch And Everything Else

Sony offers hope on PS4 console cross-play

Sony finally opens cross-play for Fortnite for the PS4 - GadgetMatch

Fortnite On PS4 Gets Cross-Play Support With Xbox One, Nintendo Switch, More

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

Fortnite on PS4 won't get cross-play support because 'PlayStation is the best'-Tech News , Firstpost

OcUK Ultimate Crossplay Guide - Overclockers UK

Fortnite coming to iPhones and Android devices - CNET

A List of All PC / PS4 Crossplay Games : r/PS4