Stream is a powerful WordPress plugin that lets you track all logged-in user activity, monitors each and every change made on to your WordPress website and provides every detail in beautifully organized way. But note that it requires PHP 5.3 or higher to be activated and used, otherwise it doesn’t shows up any stream page and displays a message that your hosting doesn’t supports PHP5.3
You must have observed this new feature of Facebook, now while posting any status update on Facebook Timeline you can manually set who can view your stream. Now you can enable same type of feature in your BuddyPress site.
This is possible to combine all your social media RSS feeds like Twitter, Facebook, Google+, YouTube and other custom RSS feeds and display them using in one stream in your WordPress site.
By default for viewing latest activity on BuddyPress site you need to refresh whole page. User experience can be made better by making BuddyPress activity stream live like Twitter so that everytime any of your member posts anything can come visible for everybody instantly without even refreshing the page.