Even when you have unlinked the two, you will notice that your Facebook profile will feature some posts from Instagram. This is because you have selected the option that allows you to share every post you share on Instagram on Facebook. To remove Instagram posts from Facebook, you will have to delete them manually.
It doesn’t hurt. You’re not thrusting the fact to your fans that you want them to follow you on Instagram, and you’re not spamming their newsfeed with posts about your Instagram content. … Bottom line – Yes, you should connect a brand’s Instagram profile to its Facebook page.
Once you unlink Instagram accounts, you can’t link them again. Instagram doesn’t allow users to log into multiple accounts with a single login anymore.
Based on the data I would not recommend posting from Instagram to your Facebook business page — unless you want to risk having lower Reach. Sure it’s the quicker/easier way to post updates to both social platforms, but it’s not worth it when Reach has the potential of being lower by doing so.
How does Instagram and Facebook work together?
Facebook and Instagram campaigns can use the same photos or video across both platforms or unique creative for each. When you’re ready to use Facebook and Instagram ads together, either add Instagram to an existing campaign by editing the ad set’s Placement settings or set up a new campaign across both platforms.