I am unable to open Facebook on any browser on my PC. This has happened a few times in the past, and was solved by flushing the DNS, an answer that I found on this website. I have found similar postings and have tried the proposed solutions, to no avail. I have re-installed browsers, turned off my firewall, and scanned my computer using multiple programs, for viruses. I feel like there must be another idea--something that I haven't tried yet. I would appreciate your suggestions.