English citations of unlike

Usage as a verb relating to Facebook:

  • 2009, Ben Zimmer, “On Language: The Age of Undoing”, in The New York Times Magazine, 2009 September 20, page MM8:
    Facebook, for instance, allows you to register approval for a posted message in a very concrete way, by clicking a thumbs-up like button. Toggling off the button results in unliking your previously liked item. Note that this is different from disliking something, since unliking simply returns you to a neutral state.
  • 2010 June 25, "TheKorn" (username), "Re: Pinball: RGP and/or Facebook", in rec.games.pinball, Usenet:
    My comment was more of a backhanded slap at Stern Pinball's Facebook "presence", specifically the garbage "cheap heat" posts. [] It's so inane (and now, so constant) that I wound up "unliking" stern pinball entirely.
  • 2010 October 25, “Medical Marijuana Advocates Try Again With Limited Bill”, in Texas Tribune:
    The recently elected chair of the Republican Party of Texas, Steve Munisteri, recently “liked” the TCCC on Facebook but promptly “unliked” it when a reporter called to ask whether he supported medical marijuana.
  • 2011 January 15, “Stephen: The opposite of paralipsis”, in Yale Daily News:
    A notification probably popped up on her Facebook already. Did unliking also get rid of the notification? I don't know