Until recently they were asking for it because they were using it for ad targeting. It was discussed here https://news.ycombinator.com/item?id=31510865 https://

Until recently they were asking for it because they were using it for ad targeting. It was discussed here https://news.ycombinator.com/item?id=31510865 https://news.ycombinator.com/item?id=31510865