Very interesting after looking up the AS number [1] you provided it includes domains that are not on that GitHub list - as you mentioned. I would have to agree with this being the better method to blocking facebook.

[1] http://www.tcpiputils.com/browse/as/32934 * note there are more than average ads on this site and it's a bit plain but this was the only one I could find that, with my brief searching, showed ip prefixes associated to the AS number.

If anyone has a better lookup tool that'd be great!

edit: Should also note that since other users are mentioning they might be under multiple AS number's maybe the ticket would be to setup a GitHub that collected these AS numbers for FB.

edit 2: found a less ad filled site! http://ipduh.com Search AS32934 click "prefixes" at top