Negativity follows!
Not sure what it's for? Seems like it's trying to get a corpus for training image recognition - but then I can't rate the tagging of images or highlight when they've failed (like one of the "car" images is an aeroplane interior).
I can't link to a tag page. The images loading are shifting about and re-ordering which I find quite discombobulating and distracting. Some images -- someone's takeaway of indiscernable type -- that are loading for the front-page are quite large, 800+kB to show me a thumbnail. I hope you're not paying by the byte!
When you say anonymous, what's the scope of that? I see your are using Twilio - does that mean you can tell Twilio to drop all logs of the sender details of the images? If I have a group of people send large images can I DDoS the site?