I do a full clear on my web browser (cookies / offline storage / history, everything) and then open YouTube in a private browsing window and it asks me which of my two Gmail accounts I want to log in with. I'd guess it's just a combo of external IP and browser fingerprint, but it's creepy.
I know they do, and I consider this a real problem. I was just saying that personalization isn't a completely satisfactory explanation for the decline in Google search result quality. It is likely to be a factor in that, though.
I do a full clear on my web browser (cookies / offline storage / history, everything) and then open YouTube in a private browsing window and it asks me which of my two Gmail accounts I want to log in with. I'd guess it's just a combo of external IP and browser fingerprint, but it's creepy.