An experience that is all users opt-in, Facebook and Instagram have begun testing a new feature that will let you easily import Instagram contact list into messenger. The two apps are making it easier to sync in with each other and import contacts with one another.
You can now visit the People tab and tap on the new option “Connect to Instagram” inside messenger to add your Instagram contacts to the list of friends you can connect with Facebook’s instant messaging application. Similarly, you can also add your Instagram contacts from within the Messenger.
One can only add mutual follow contacts from Instagram. This step is taken to avoid adding followers who can possibly spam your on messenger.
Via: Tech Crunch