On KOM Informatics you can allow different levels of access to your feed. Friends will see your rides in their feeds, and they can comment on them. Coaches can not only see your rides, but they can comment on them in a section of the ride page visible only to them and you. Coaches also have the ability to view all of your reports. Coaches have the ability to designate workouts as "private" which means only they themselves, and their coached athletes can see the workout.
Hillsborough, NJ USA