Along the lines of opting out, they don't let you log out of Instagram if you have a Facebook account linked to it. Click the logout button and notice how they

Along the lines of opting out, they don't let you log out of Instagram if you have a Facebook account linked to it. Click the logout button and notice how they ask you if <username> is you. Click this button to "continue" and magically you're logged in. No asking for a password! Just click a button because you never really logged out. Ridiculous!