Questions about apps (like Uber, Instagram, etc)

Question

How many lines do you think an app like Uber, Instagram, or Snapchat took to make? How many classes do you think each contains? What would their UMLs look like?

Were they (or could they have been) written by a single person?

I understand this question may not be answerable unless you were a programmer for _____ & have access to the code, but if you had to guess...?

Also, what languages are they written in? Thank You!

Answer 1

I only know that Instagram is written in Python with Django framework. As a man who works with django I can completely recommend it if you are fancy creating web apps. How many lines of code? Hella lot. It's really hard to say. Just lots of. Same goes with classes. I'm guessing that it's around 100 classes easly.