I Agree with @navinachettri This plugin codes should be made part of the core BuddyPress Trac Development.
Hi everyone,
I found a working alternative here – http://solvemyquest.com/move-new-commented-activity-stream-to-top/
Just add the code to your bpcustom.php file. No idea what that is? Go to your plugins folder in Cpanel or via FTP and create a file called bpcustom.php. This is where you can add custom codes for Buddypress that will not be overwritten when updating Buddypress.
Please be sure to comment at solvemyquest.com and thank the author for the fix. 🙂
Update – as of today there is an issue posting comments at solvemyquest.com, also the contact us page is blank lol. Please try to thank them, I’m sure it’ll be fixed up soon 🙂