This is a cool paper, I love recommeender ideas. I've always set up a multi algorithm bake off for live systems. And every time, showing a block of popular link

This is a cool paper, I love recommeender ideas. I've always set up a multi algorithm bake off for live systems. And every time, showing a block of popular links, either globally, or in the category gathers more clicks than any smarter algorithm. YMMV, but I always found this depressing! Popular is popular is clicks.