You know how the activity streams in the control panel for some individuals gets totally overwhelmed with following/unfollowing activity? I turned it off.
This does not impact the follow/unfollow of your broadcasters on Twitter, that will still show up as it is very useful. This just impacts the individuals following each other within your nation.
If you want it back (or find any other activities annoying), you can always adjust which dashboards any activity is displayed on under Settings > Activities.