"You seem to be imagining very impressive machine learning" It doesn't even need machine learning. I've got an image aggregator that can recommend images to me

"You seem to be imagining very impressive machine learning" It doesn't even need machine learning. I've got an image aggregator that can recommend images to me based upon what I like, why I like it, and IT LEARNS. Only a couple of times of telling it I don't like this subject matter in the picture, and it won't show me pictures with that subject matter in it. It's nothing more than a game of association and having a reliably fast database with proper tagging. "Currently many forums just use a heuristic based on date and "total number of upvotes" to decide what to display." That's not a heuristic. That's a simple if post count upvotes > x number, display here, if < this number, don't show. That's simple child's play TI-BASIC level programming.