Like Instagram but not your likes on Facebook? Well read on partner - here’s how to stop that. These instructions are for Instagram for iOS
Open the app and tap the profile button (circled).
Tap on the settings button in the top right of the app.
Tap on ‘Share Settings’.
Tap on ‘Facebook’ (it will display the linked account name in the list item).
Toggle the option that says ‘Share Likes to Timeline’.
That’s it, your likes will now stay off of your timeline.
You can change where you images are posted here too. If you have a company page on Facebook, you can set it so that your images are posted there rather than on your normal timeline.