Oxford English Dictionary has chosen "Unfriend" as the word of the year. The news came out almost exactly one month ago, but the debates on "unfriend"'s merits as a word continue.
The OED offers their process here, which is a good read - http://blog.oup.com/2009/11/word-of-the-year/ The word must be widespread (certainly, "unfriend" fits the bill), but somehow previous year's words seem slightly less colloquial and more relevant... take 2008's "hypermiling" and 2007's "locavore."
