Activities: Advanced Forum
Moodlerooms Development, 
Sean Flanagan, Advanced forum are designed to increase engagement and provide a modern alternative to standard Moodle forums.
Advanced forum reduce complexity and work like the modern messaging systems students use every day on the web and their mobile devices.
Unlike standard forums advanced forums are responsive, so users can read and post from their mobile or tablet. Advanced forums have been specifically designed to improve the usability and accessibility of Moodle forums.
Posting and replying are all done via ajax to save page loads, take less clicks and increase engagement, while maintaining the user's context in a discussion thread.
Advanced forums contain a number of additional features including the ability to see who has engaged in a discussion before you open it, a setting to show recent forum posts on the course page, subscribing to individual threads, private replies and an option to allow anonymous posting, post bookmarking, along with all the features standard moodle forums have.
Advanced forums are design by Mooodlerooms in partnership with The University of Montana.
Useful links
Screenshots
You can fix this?
I have tested this with 3.2 and it does indeed work. I have not done extensive testing, but so far it appears to work exactly as it did in 3.1.
Did the search work in your test? There is a tracker item for this from January: https://moodle.org/mod/forum/discuss.php?d=345465&mode=1
However, I have just discovered a rather bizarre problem with the upgrade. Though everything appears to function properly, several posts from students have been truncated. Their posts are present in the upgrade, but for some strange reason they are much shorter than in my backup. I have only discovered this after being on the new system for two weeks, so I will need to copy the old posts to the new system or write some kind of script to do it! :S
After installing the Advanced forum, I proceeded to try it out on the Moodle Mobile App where I was shown a message "UH OH, this plugin is not supported, view in browser"
Is this plugin supported by the Mobile App?
If it is supported, can anyone shed some light as to why I get this message?
the module is not currently supported in the mobile app. When the work was originally done to add support it hit some limitations with the mobile apps ability to interact with 3rd party modules which prevented it from working. It is intended to support the app at some point, but I'm not sure when that is currently scheduled to be delivered.