See a live demo at maply.kaiserapps.com.
You'll want to create a room either by visiting that page and entering it, or appending your room onto the url like so: http://maply.kaiserapps.com/myroom
Once your friend joins you'll both be able to see each other's location!
Dependencies: postgres
Installing the project node modules:
npm install
Setting up postgres (make sure you already have a postgres user in your username):
createdb maply
Then run the server once with a special flag to sync the db:
npm run syncdb
npm start