Okay, I just pushed a commit to !postActiv nightly that has hubsub callback blocking for instances.  What does this mean?  Basically when they hubout messages to you, these messages can be blocked.

!!!! Things to note: !!!!
1 - @-mentions are not blocked, those are done with salmons.
2- YOUR OWN hubouts are not blocked, so they will still be sent out to banned instances (for now)

To do this on latest !postActiv nightly, add this to your config.php:

$config['site']['sanctions']['banned_instances'] = 'site1.com,site2.com,etc.com';

Change as desired.

Report any problems to the issue tracker as always, so it doesn't get lost and we get any problems fixed.  I'm going to get some sleep, or try to, and then work on outgoing hubouts.