A couple million photos a day are uploaded to Flickr and each day a few hundred are picked for the "Explore" section based on some algorithm about number of views, likes, etc. I've been posting photos there for 11 years and never had a photo make it but today this one did.
Here's a link to the Flickr Explore page.
https://www.flickr.com/photos/gakins.../in/datetaken/