BuddyPress.org

Where in the code is it determined where the page displays the post form for
personal activities?
I would like to do something like this, but I know it won’t work
Please help.

function change_post_form() {
	if ( $currentpage == 'just me') :
		bp_get_template_part( 'activity/post-form' );	
	endif;
}
add_action( 'bp_before_member_body', 'change_post_form' );