To be contrarian - Facebook is transferring its own user base to Instagram at a quarterly rate which is convenient to shadow Snapchat. The people I see there aren't much different than the ones on FB every month. FB is notifying me that, every single friend on FB is now on Instagram.

My likes on Instagram aren't shown to my followers - (I hope ) and that's the main difference which affects my behavior. Likes on instagram are cheap, like a casual double tap. On FB or LinkedIn they're expensive.