freitasm: Gary thanks for looking, but this is intermittent and it may be working for you now, but give some time and it will stop working again - as it happened to D1023319.
Hi Mauricio. We realise that the reported behaviour is intermittent, and we have looked into it over a period of days based on those reports. There are no issues inside our network, as noted earlier. I note that this thread also indicates that a customer of another ISP has reported the same problem (ie, a customer on another network), and another Geekzoner has said that there are overseas reports of problems with Facebook.
However, we are keeping an eye on this and will take the appropriate action should we find anything that indicates the cause.