I have had an Instagram account for awhile to highlight my teams, but I really have never gotten around to using it. And I definitely have not taken the time to figure out who to follow before this.
But here are some accounts that look like they would be helpful for my coaching:
basketballcoachesinsider - videos of drills and talks by basketball coaches
basketballtraining_drills - videos of different training drills for players to use
basketballshootingcenter - videos of drills to become a better shooter