This is something I researched extensively for my thesis in technology and education. iPads, tablets, phones, they all show positive effects on their development. Yes, including social.
I've seen a lot of anti screens on here recently but there is nothing wrong with kids in buggys on tablets, kids in cafes on iPads.
There are obviously caveats, some content is bad. It's on a scale but it's easy to see; a child playing Duolingo is vastly better than candy crush, a child watching How it's made is vastly better than cocomelon. Also the content needs to be locked and monitored for safety. However, tailored content can be better than a teacher.