Version 7.5.6 is now available for download. This is a quick maintenance release to fix up a few bugs that have been lingering around. It also has a couple bonus features, a facebook like button and a tweet button for each topic.
Note, that both the facebook and tweet buttons are disabled by default. You can turn them on in the control panel under Display Options -> General -> Topic Display Options.
You can find the list of fixes and a couple of bonus features in the 7.5.6 changelog
You can discuss this announcement here