This is not about SEO, but regarding some basic about alexa site linking. I have seen that some website owners doing some SEO tricks to ping every links they make to Alexa also. I also have some sites that had posts and videos in Google plus, Youtube, Facebook, etc, but they are not showing in alexa. I am not worry about this, as alexa has nothing to do with SEO. But i really want to know how a 3 months old site can make so much of links and ping to Alexa?