If you're using a hosting service like Joyent, it actually comes with the Facebook PHP client library installed, along with MySQL and memcached.
If you're not using a hosting service that provides you with a preconfigured environment for Facebook applications, then you need to upload the client library and install MySQL.
Coming Soon, Free Hosting for Facebook Apps - GigaOMAccording to AllFacebook, there are 7,782 Facebook applications, of which four have a million daily users, while 91 applications have been installed about a million times. The majority however have 10,000 or fewer installs. So there is a large number of app writers — especially those with 10,000 or fewer users — who could benefit from getting this service, which typically costs about $45 a month, for free.
You can have as many applications on the Facebook Accelerator as the resource quotas allow (512 MB RAM and 10GiB Storage). You may also build applications on non-Facebook platforms, however, your Facebook application must remain active and in use in order to remain qualified for this program. An active Facebook application is defined as application that has more than 50 total users. The number of users is obtained from thisURL: http://www.facebook.com/apps/application.php?id=
Support
Joyent provides no support for this free service. Knowledgebase is here. We also have a very helpful and knowledgeable user community on our forum,
Joyent: Accelerator
