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You or someone you are friends with on Facebook plays Farmville (or Farmtown). These games have over 60 million regular users. But guess what -- by any means of measurement, these games are terrible.
For each super-popular app-game on facebook, there are 10,000 free flash alternatives on the web that run more smoothly, with less ads, and have more features. So why do people play these games? Simple: they already have an account. Facebook eliminates the first barrier to entry, and with friends already playing, the users are content to follow.
This is an important lesson to be learned here when converting to social media; in this age you have to go where the people already are to be relevant. Millions of people will play an inferior game because it's easier than typing in a different website -- why would they visit your domain? Why would you want them to?