That's not porn, but a computer needs to be trained to tell the difference. After all, Twitter also serves up images of half-naked babies and breast-feeding mothers. It should be noted that this kind of algorithm is far from perfect-and identifying something like porn is particularly difficult. And according to David Luan, whose startup, Dextro, works to identify similar photos for other companies, spotting images on Twitter carries unusual challenges, because the company must serve content across its network in near real-time. But they're already identifying NSFW photos on Twitter's live service with what would seem to be impressive accuracy. Though Roetter and Farabet decline to reveal the size of these neural networks, these probably are much smaller than what is already running at Google and Facebook. Neural nets are particularly ripe for this kind of magnanimous recursion.
