It's not about the hosting. It's about speed to first code commit. When you're setting up your first Facebook app, there's a bunch of docs to read, you need to

It's not about the hosting. It's about speed to first code commit. When you're setting up your first Facebook app, there's a bunch of docs to read, you need to create keys/IDs, figure out the URLs you need to populate, understand how FB Connect works, etc. As someone who tinkers with FB apps and not actually launched one, it took me most of a day to setup a fresh EC2 instance and get everything configured. However, it took me only 10 minutes to get my first "Hello world" app launched, without having ever used Heroku before. That's the big step forward here -- a turnkey skeleton app that eliminates the initial frustration. For big app developers, this is of no value. It's for tinkerers like the rest of us to get to baseline faster, and is designed for us to get sold on Heroku and get our feet wet with FB app development.