New to Elgg 1.5 is a comprehensive activity stream which provides an at-a-glance look at activity from across the site, as well as your friends' activity and your own actions. You can keep track of what your friends are doing through the notification method of your choice. Choose whose activity you want to subscribe to, and have it delivered using the notification method. Email and internal messaging are supported out of the box, and further methods can be added via plug-ins. Elgg is an open, flexible social networking engine, designed to run at the heart of any socially-aware application. Building on Elgg is easy, and because the engine handles common web application and social functionality for you, you can concentrate on developing your idea.