I read your comment, opened snapchat, pinch&zoomed in-an-out everywhere. I couldn't find the map. I'm more than 30. I'm putting down my phone and reading a book.
I'm early 30s and relatively tech savvy, the snap app is the hard app to figure out.
I'm 22 and also tech savvy, but I find it quite simple to use.
I think the target users are those that have pinch-to-zoom interfaces as kids (the today's teens), so the UX is meant to be "cool" instead of intuitive.
Another thing I've seen quite a lot is that you need to invest some time and have lots of friends already using the platform to know about the hidden gems, which I think the app itself promotes that behavior of friends sharing their knowledge instead of easy to use UI (not saying I think it's a good thing)
Discover section? Nope. Somewhere at the top or bottom of my friends list? Nope. Somewhere in Ghost icon thing? Nope.
So I gave up and googled for help. Turns out you have to pinch-zoom-out anywhere.