This document provides an overview of writing science for the web. It begins with a brief history of scientific blogging, noting its origins in the late 1990s to counter anti-science claims and its growth with research blogging and aggregator sites. Reasons to blog about science include increasing visibility, developing an online reputation, and seeing science from new perspectives. When writing for the web, it is important to know your goals and provide the right level of detail for your audience. Links, images, and other multimedia can help explain concepts but should only be used when truly useful. Proper attribution of sources is also important.