The first time you try to post, comment or like something, the app asks you to sign up or sign in with your email address. You can read and browse everything else without signing in.
Why you are asked
Signing in puts your name on what you post. That means:
People can see who wrote a post or a comment.
You get a notification when someone replies to you or likes something you posted.
You can go back later and edit or delete your own posts and comments.
What happens to your email address
Yapp does not email you marketing and does not share your address with anyone, including the organiser of the event you are attending. It is used to identify you as the author of your own content.
For the detail, see the Privacy Policy.