I’ve seen few images on the web hosted by “postimg.org”, which seems to be a subdomain for “postimage.org”.
When checking these links on virustotal, they show up clean (no blacklists I mean), but scans for postimg.org IP shows up quite a few blacklists for different image links.
https://www.virustotal.com/en-gb/ip-address/108.162.204.60/information/