SharePlay and other ways to connect users on iOS

Apple announced iOS 15 on WWDC21 in June. As always it would be better, cooler and fancier than ever. SharePlay was announced together with other stuff. This technology allows to extend FaceTime calls with third party apps. Main focus was on movie nights and other media uses. However, technology doesn't stop there. Let's take a look on how we can use this technology and how to merge it with others, what to take into consideration to make apps where users are working on content together. And, most importantly, why do we need to use this technology at all.