You can't really see such things from the outside. However, by hoovering over the "Join for free" button, you see a php link (the target of the button is signup.php, so the language probably is php (You can't be sure as it depends entirely on the configuration of the server).
manpreet
Best Answer
3 years ago
I've looked all over the web and stackoverflow and can't find anyone talking about stubleupon.com's lineup. Including: framework, language, database, etc. Does anyone have any idea or at least a guess? - thanks