It's based on the Facebook API, so it at least makes sense to write some of it in PHP. I've seen this way too often where people seem to think that you need to

It's based on the Facebook API, so it at least makes sense to write some of it in PHP. I've seen this way too often where people seem to think that you need to write in PHP to use Facebook. This is absolutely incorrect and false! I've shipped a number of Facebook applications that are all in Rails that use the creaky RFacebook gem. Even though it's creaky and old, due to the magic of method_missing, this gem handles all the new Facebook API calls magically without a code change. PHP developers need to wait for Facebook to update their library to get the same support (or update it themselves) Having said that, since it's written already, and is ready to launch right now, you absolutely must launch it. Right now. If it takes off, you can decide where to deploy your resources later. Nothing beats shipping product.