First, a BBC News Magazine article on 'shill reviewing'. I've never come across the AmE word 'shill' before but I have encountered a few shill (or false) customer reviews in my time. The article also lists some other striking terms such as 'Amazon bombing' and 'Astroturfing'.
Second, the word 'squelette' (as in French for 'skeleton'), meaning a 'ruined' building that was never actually completed. Stan Carey from the blog Sentence first drew my attention to this on Twitter; thanks, Stan.
Squelettes in Egypt