What can Ruby on Rails accomplish?

Hello! I’ve been taking the past few days to learn Ruby on Rails. I have some books and am making progress. However, it’s feeling to me right now that some of the things I want to do as far as websites that I have in mind might now be possible with just an understanding of Ruby on Rails. To gain some perspective on this. Can someone please tell me if, in theory, would it be POSSIBLE to create the following website knowing only Ruby On Rails: Shootmap.com

This is a website I have been associated with for a little while. i was considering creating an identical site in RoR if it was possible.

Going in, I had thought you could do almost anything with RoR but I that mentality is fading.

Additionally, hypothetically, could sites like Youtube/Vimeo, Animoto, Foursquare, Facebook, all be created with RoR if someone wanted them to be.