In SF, maybe. But most developers in the world live outside of SV (for example, there are on the order of 1M C# developers worldwide). They don't write blogs, or even read them.
Developer outside of SF (outside of USA, in fact) here. I read blogs, have written them on occasion. Have worked with many developers in many non-SV locales. None of them read programming books, most of them read blogs.
Developer outside of SF (outside of USA, in fact) here. I read blogs, have written them on occasion. Have worked with many developers in many non-SV locales. None of them read programming books, most of them read blogs.