Studies allows you to email stacks to other Studies users, or upload them to iCloud and post a link to friends.

If you navigate into a stack, and tap the action button at the bottom-right, you can share the stack by tapping Share Stack.

When you do this, you are presented with a screen asking you to choose a format. The Studies App Archive format is usually best for exchanging with other Studies users.

After you have selected a format, there are a number of actions you can take. You an email the stack as a file, open it in another app, or upload it to iCloud and share the link. A link can be copied for pasting in other apps, emailed, or posted to Twitter or Facebook.

You can also share from the main menu. Tap the button top-left in the Library, and select Send and Receive in the menu list. Tap on Send Stacks, select a stack, and tap the Share button. Continue as before, selecting a format, and choosing a delivery medium.