Today I opened the source page of Stack Overflow' home page, but couldn't find any
meta tags in the
meta tags are very important to SEO, and highly recommended by web designers, I just have this question: why doesn't SO use this tag?
SO is #198 in Alexa rank and, every question any user asks can be found in Google just one minute later.
Does anyone know how SO pings Google after a new page is submitted? And why it doesn't use