bbPress.org

add this to your theme’s functions file

add_action( 'bbp_template_before_forums_index' , 'rew_shortcode' ) ;
add_action( 'bbp_template_before_topics_loop' , 'rew_shortcode' ) ;

function rew_shortcode() {
	echo '<div class="social_login" >' ;
	echo '<br>' ;
 	echo do_shortcode('[wordpress_social_login]'); 
	echo '</br>' ;
	echo '</div>' ;
 }

It may not be perfect, but without seeing its effect on your theme, I can’t say, so come back when it is in if it needs tidying up