For the life of me, I am unable to find the link to the article that I read a couple of months ago about the demographic make up of the Huffington Post readership. The article focused on how the Mission statement of the Huffington Post has nothing to do with what actually is happening in their comments section, how Talk Backers that dissent without violating the Terms of Service in the face of blatant antisemitism get banned on regular basis, while the offending TalkBackers who post blatantly antisemitic posts and violate the Terms of Service remain for years. The article talked about the specific demographic make up of the readership of the Middle East/Israel/Gaza, that amongst the regulars there are over 300,000 are registered users from the 22 Islamic countries, that the other large group is from Canada UK and other smaller European nations and only a very small minority is from the US.
Unfortunately I can not find it, I wonder if it was taken down "by force".
Regardless, here is a website that monitors hits and demographics of most online media sources: