Like in [this other thread][1] I would use "in the internet" in the context of Application Programming Interfaces, or APIs. While an Average Joe user reads content off the "front" of a website (its Graphical User Interface, or GUI), a function call to an API actually sends a programming thread into the content of the website to retrieve the answer. That retrieval lends a sense of depth, of looking something up _in_ a website, that reading content that's already displayed _on the front_ just doesn't.

  [1]: http://english.stackexchange.com/questions/82867/do-you-say-content-is-in-a-website-or-on-a-website