public static function get_social_link_svg( $uri, $size ) {
    static $regex_map; // Only compute regex map once, for performance.
    if ( ! isset( $regex_map ) ) {
      $regex_map = array();
      $map       = &self::$social_icons_map; // Use reference instead of copy, to save memory.
      foreach ( array_keys( self::$social_icons ) as $icon ) {
        $domains            = array_key_exists( $icon, $map ) ? $map[ $icon ] : array( sprintf( '%s.com', $icon ) );
        $domains            = array_map( 'trim', $domains ); // Remove leading/trailing spaces, to prevent regex from failing to match.
        $domains            = array_map( 'preg_quote', $domains );
        $regex_map[ $icon ] = sprintf( '/(%s)/i', implode( '|', $domains ) );
      }
    }
    foreach ( $regex_map as $icon => $regex ) {
      if ( preg_match( $regex, $uri ) ) {
        return self::get_svg( 'social', $icon, $size );
      }
    }
    return null;
  }