Wow, looks like my router was hacked. It was redirecting me to a fake Facebook login and telling me to install an update (pn all my computers). Luckily I suspected it was phishy and my browser couldn't verify the site despite my address bar showing Facebook.com. Had to factory reset my router - I also run 2 separate networks so I wasn't dead in the water. Times are changing - it's the Wild West out there.