I've written a post about how we scaling AWS Aurora at ticketea when we go to sell some big event. It's available on our engineering blog.
NOTE: this post was originally posted on Medium, so some comments still leaving there: medium.com/@patoroco.
UIActivityViewController was introduced in iOS 6 as a helper to share texts, links or images between apps.
It's really easy to work with default services (share on Twitter, Facebook, Mail…), and since several iOS versions, it's also integrated with third-party apps like Slack or Telegram.