A newsletter can be a powerful tool as you not only make sense of your thinking, but also share this work with others. I believe that the process of reflection is involved as you create and publish a newsletter. I often have colleagues suggest that an RSS or Twitter feed, or subscriptions to their website is the same thing as a regular newsletter. IMHO, it is not the same thing. A good newsletter serves a specific purpose, and includes synthesis and reflection for you or your audience. You are actively curating content online
Ian O’Byrne on Three questions to consider as you develop an awesome newsletter