The quote is from the ZDNet article (reference [1]). It says that Facebook brought up this clause specifically as a reason why the implementation violates Facebooks's terms. Here is a little longer quote for more context:

> Unsurprisingly, Facebook didn't like this change. A spokesperson told the German publication that the way it has implemented the Facebook Like button violates the Facebook Platform Policies, specifically quoting this clause:

>> 8. You must not use or make derivative use of Facebook icons, or use terms for Facebook features and functionality, if such use could confuse users into thinking that the reference is to Facebook features or functionality.