Release Notes: This release is significantly faster and contains almost 800 significant code changes. You can now subscribe to a user's content and have it delivered via the notification method of your choice. There's an integrated Twitter-style microblogging service. You can embed rich media into your content. There's a new design, and there are many other changes.
Release Notes: This release has been completely rewritten. It is very flexible and extensible, has excellent programming APIs, and runs well as a stand-alone network out of the box.
Release Notes: New profiles were added, including widgets. Groundwork was done for OpenID client and server (available separately as plugins). The architecture and APIs were revamped. Miscellaneous bugs were fixed.
Release Notes: Much easier installation. Some bugfixes.
Release Notes: This version includes many new features, including photo galleries, open APIs, enhanced internationalization, a community browser, new theme structure, simpler navigation, improvements to the WYSIWYG editor, OPML output, and more.
Release Notes: The codebase was significantly refactored, including a data abstraction layer with Postgres compatibility, ClamAV integration, Moodle integration, an automatic database installation and upgrade engine, improved security from cross site scripting attacks, and significant scalability enhancements.