what is the simplest way to make a facebook app?

[Azmi]

The only thing i'm good at is javascript. I don't like learning PHP. I was thinking on creating an app that decides what is the character of the person in a movie.

[Brendan]

Firstly, make sure no one else has beaten you to your idea

Javascript is a browser or client based programming language. While it is technically possible, you'll be hard pressed to implement your idea in js alone (considering you might be interacting with a database, scraping third party websites and talking to the Facebook API). Also as it is client based, all your code would be exposed to the browser allowing anyone to steal your code and hard work!

Take a look at Facebook's dedicated Developer guides and see if they help motivate you:

https://developers.facebook.com/docs/guides/canvas/

All the best!