Is this not the same as integrating 'Login with Facebook' and sharing my user's profile data with a third party service using server-side API requests? A practi

Is this not the same as integrating 'Login with Facebook' and sharing my user's profile data with a third party service using server-side API requests? A practice that I'm sure is rife. The third party JS scripts simply cut out the middleman, but as a side effect the sharing is detectable.