social_media_acf_shortcode.php

function my_acf_shortcode( $atts ){
    $atts = shortcode_atts( array(
        'field' => '',
        'image' => ''
    ), $atts, 'showfield' );

    if ( get_field( $atts['field'] ) && ( $atts['image'] !== '' ) ) :
        return '<a href="' . get_field( $atts['field'] ) . '"><img src="' . $atts['image'] . '"></a>';
    endif;
}
add_shortcode('showfield', 'my_acf_shortcode');