If you cannot currently access Facebook or Farmville from your computer or mobile device, you are not alone. Facebook is currently down in many areas world wide as reported by major news sources and trending on Twitter. All we can do is try from time to time and see when it comes back up.
Tech Crunch has contacted Facebook for more information, to see what they find out check this article periodically.
For Social Media updates on Facebook's status, click here for the search results on Twitter.