Would simply using AWS to build an application make this application a distributed system?

For example if someone uses
RDS for the database server,
EC2 for the application itself and
S3 for hosting user uploaded media,
does that make it a distributed system?

If not, then what should it be called and what is this application lacking for it to be distributed?

Update
Here is my take on the application to clarify my approach to building the system:

1. The application I'm building is a social game for Facebook.
2. I developed the application locally on a LAMP stack using Symfony2.
3. For production I used an a single EC2 Micro instance for hosting the app itself, RDS for hosting my database, S3 for the user uploaded files and CloudFront for hosting static content.

I know this may sound like a naive approach, so don't be shy to express your ideas.