Interesting! From this link, I also see the logo on my rMBP (in Chrome or Safari) – but not in the IMGUR link I posted above, even though the IMGUR link reveals

Interesting! From this link, I also see the logo on my rMBP (in Chrome or Safari) – but not in the IMGUR link I posted above, even though the IMGUR link reveals the logo on an iPhone7 iOS/10 MobileSafari. Changing Chrome/OSX to report its User-Agent as iOS9 MobileSafari does not help get a different image from IMGUR.