Can't comment on or like comments on Huffington Post and possibly other news sites
It seems to register my "like" with a flash and reload, but the like count does not move. With comments, it tells me to log in, but ignores my login once I enter it. I am using Safari at present on my iPad. I don't know how to find out my OS version...
MacBook Pro with Retina display, OS X Mountain Lion (10.8.5), 15" early 2013 | 8GB 1600MHz DDR3