Should all authors blog? Of course not. We’re all different and we write for different audiences. There are lots of ways to establish an online presence. Anne Rice does a good deal of publicity from her Facebook page, and Stephen King is big on Twitter. Cheryl Strayed and Elizabeth Gilbert communicate with fans on Instagram.
Would a blog work for you? It might. Blogging is the best way to make friends with Google (otherwise known as SEO or Search Engine Optimization.) That means readers can find you through search engines. In other words, a blog helps readers find you and your books.