If you have blog posts that are key pieces of content - for example, our post on how to get your first 1000 users - then you should look to update it every year to keep it fresh. Adding an "updated on" date will then be picked up by Google and the new publication date will be reflected in the Google search rankings. While Google doesn't necessarily care about publication dates for its own ranking purposes (which is why some blog posts don't have dates at all), users do. So this is a great way of both boosting SEO and increasing the chances of click-through.
