Clean up the language when explaining the notion of network latency.
Clean up optimisation para.
Add some extra notes about the PHP SDK.
It is easier to copy and paste code from the HTML instead of the PDF.
Move the app secret and app ID to a separate constants file.
Secure URLs are needed for Canvas apps now. Facebook does not allow users to turn of HTTPS any more.
Remove the Canvas app sample since that requires HTTPS properly configured.
Make sure we use the 4.0.9 version and not bleeding edge... lest we bleed ourselves.
Implement working login and user name display.
Deal with short- and long-lived tokens for Facebook.
Fix logout.