http://www.lulu.com/content/1269306"Some websites are designed to be games. Most are not. But have you ever heard people, or found yourself addicted to Digg, YouTube, or Facebook? Have you ever wondered why? Well, it’s because they are games, at least partially! Officially, they are…
Könyvajánló
2007.12.09. 11:44 |
kritta
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Címkék: digg youtube facebook konyvajanlo
