WordPress shortcode Hide Content From The Public

edit function.php

function guest_check_shortcode( $atts, $content = null ) {
	 if ( ( !is_user_logged_in() && !is_null( $content ) ) || is_feed() )
		return $content;
	return '';
}
add_shortcode( 'guest', 'guest_check_shortcode' );
function member_check_shortcode( $atts, $content = null ) {
	 if ( is_user_logged_in() && !is_null( $content ) && !is_feed() )
		return $content;
	return '';
}
add_shortcode( 'member', 'member_check_shortcode' );

Usage:

Curabitur risus turpis, tincidunt nec porta non; tempor vitae erat. 
[guest]This content is only visible to members, subscribe here to get access to all our awesome tips or log in here if you are already a member[/guest]
[member]Your awesome tip and member-only content comes here[/member]
 Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; In hac habitasse platea dictumst.