Create an electronic cigarette web crawler [on hold]

I'm wondering how is it possible for a simple Wordpress website to act like a web crawler please see this example: http://ift.tt/1K2MZwS

I want to build this for the US market. What are the best programming languages to do this? Also, in what language is this written? More info here: http://ift.tt/1CjIYOq Thanks!