Download the deb they have built, install it, then restart Pidgin! You will then have a FacebookChat option in your accounts manager dialog.
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wbinfo -u. If you don't do this, you can't use sudo, pwd won't work (a lot of stuff breaks, essentially). So, to hack around it, I wrote a script called keepActiveDirectoryAlive and put it in
sleep 30s; wbinfo -u;
wbinfo -uto run in
/etc/rc.local(though I seem to remember Ubuntu/Debian ignoring this file) so that I can login through GDM. It seems to be working as expected.