The American Dialect Society, at its recent annual meeting, chose the prepositional use of “because” as its ‘Word of the Year’:
http://www.americandialect.org/because-is-the-2013-word-of-the-year
The Society considered other words, such as “twerk” and “selfie”.
It’s interesting to look at past ‘Words of the Year’. One realizes how changing and ephemeral the vocabulary can be (“plutoed”, 2006; “occupy”, 2011), whereas other words are likely here to stay (“google”, ‘Word of the Decad; “app”, 2010):
http://www.americandialect.org/woty