How to create custom authors links

Question

You can use author_link filter to change the author’s link

add_filter( 'author_link', 'wpse110967_author_link', 10,2 ); 
function wpse110967_author_link( $link, $user_id ){

  //Retrieve authors url from user meta
  $_link = esc_url( get_user_meta( $user_id, 'wpse110967_author_link', true ) );

  if( $_link )
      $link = $_link;

  return $link;
}

In the above example its assumed that you’ve stored the author-specified url as user meta with the key wpse110967_author_link. If no url is found, it fallback to the default WordPress url.