What’s Your Favorite Online Game?

My kids through the years have played everything from Club Penguin to Stardoll!  Adults though seemed to be getting hooked these days as well.  I'm constantly getting requests on Facebook to take part in games ranging from Fish World to Zynga Poker.  I can't help sometimes but wonder what the attraction is?  Then a friend told me about a game named Bejeweled Blitz.  So, I gave it a shot.  You can play it in 60 seconds for free on Facebook.  The problem though, it is addicting and can become time consuming.  The bright side though, it's mindless and great stress relief.  So what game do you like?  How about Cafe World?  I got a request from a Facebook Friend for help getting sausages to make a world famous pizza.  Then there's Farmville, where you really have to take care of your animals and crops.  How about FrontierVille, CityVille or Empires and Allies just to name a few?  What's your favorite and why?