Instagram and facebook issue?

[crystal castles]

Ever since my friend signed up for instagram using my phone my facebook doesn't link with my instagram account anymore, it links with theirs. I never get any facebook notifications (like when your friends join instagram, or when your facebook friends find you by linking their accounts with instagram) and now my friend gets all of my notifications and auto-follows from friends they don't even know. How do I unlink their account and link mine back? On facebook it doesn't say what my instagram account name is, just that it's linked to the app in general.
i don't know what you mean, they've been signed out for a while only mine is ever signed in. should i maybe reinstall instagram?

[Daniel]

its Probably Because there Account is Signed in on your phone Log them out On your Phone and Log your Self in and it Should Automatically Start Linking with your Account