There is still a lot of debate surrounding this question – every industry and every demographic sees different content consumption patterns. But in general, fresh content should be posted no less often than twice a week. As for an upper limit, there is none – studies seem to show that posting once a day, or even several times a day, is a very effective way to drive traffic to a website. It’s just a matter of deciding how much time and effort you can devote to creating content. Google is known to give more prominence to websites that update their data on a frequent basis.