The post is old but i have been working for some time now on responsive layouts, so ill add here the solution came with for other users
add to the styles
.fb-comments{width: 100% !important;}
.fb-comments iframe[style]{width: 100% !important;}
.fb-comments span{width: 100% !important;}
.fb-comments iframe span[style]{width: 100% !important;}
.wasocial_facebook_comments .fb_iframe_widget {width: 100% !important;}
.wasocial_facebook_comments .fb_iframe_widget span[style] {width: 100% !important;}
.wasocial_facebook_comments .fb_iframe_widget iframe[style] {width: 100% !important;}
and the facebook comment box will now turn to responsive layouts, now for the facebook feed use the same code but change each of the


with

