UA: Elmer, the Thinglink ImageBot (http://www.thinglink.com/help/ThinglinkImageBot)
Protocol: HTTP/1.1
Robots.txt: No
Host: AWS
54.72.0.0 - 54.95.255.255
54.72.0.0/13, 54.80.0.0/12
Requested only html files but was 403d. Per info on their site, if access was sucessful, this bot would gather data on images for social media tagging management.