I missed the start of this discussion, but... As near as I can tell,
facebook is accessible through Internet Explorer. Turn off the virtual PC
cursor and use the page's keyboard shortcuts to move through your news feed,
comment, like, and post your status. Am I missing something?

I agree that accessibility is rarely a priority in modern web page
development. The pages are designed for visual appeal first, and retrofitted
for accessibility later. Facebook is a clear example of this. Nonetheless, I
can use it for the common facebook tasks that I need.
-Paul