remove meta box

Hi all,
I’m trying to figure out a way to remove or supress a meta box from the addthis widget from displaying on the home page of my mobile site. (I want it on the desktop site.)

any how I was playing with this script on the functions.php page but no luck. It manages to remove all widgets and the footer.

function remove_meta_boxes() {
	if ( is_home() )
		remove_meta_box( 'addthis_toolboxdiv','post','side' );

}
add_action('sidebars_widgets', 'remove_meta_boxes');

Any clues as to what I am doing wrong is greatly appreciated.