I have just applied a Facebook developer account, during the registration process, I have been offered a free hosting service – joyent.com.
The free hosting account has everything pre-installed and configured for various programming language, e.g. PHP, Python and Rail.
You will receive an email with the login information like Webmin, a pretty primitive control panel, your own Apache, MySQL ,SSH, sFTP and mail.
The free service runs on Solaris, 2 Quad-Core Intel© Xeon© processors, un-metered bandwidth*, 1/32 of CPU usage. 512MB ram and 10GB space.
I am still very new to Facebook application development, meanwhile, checkout
see also : http://wiki.joyent.com/facebook:kb:start , http://www.joyent.com/partners/facebook/