word choice - Over the Internet or On the Internet?

I have come across both the phrases - 'on the internet' and 'over the internet.'

I'm pretty sure that both are correct but then which to use when?

Please note, I'm well aware of all over the Internet which I'm not concerned about.

Answer

I would generally use "on the Internet" when I'm talking about the Internet as a location:

I found this picture on the Internet.

I would use "over the Internet" when I'm talking about the Internet as a means of content delivery:

I downloaded this picture over the Internet.