I think I’ve found a way to get the likes to show up in the activity stream. Go to the Likes settings in your admin page, and click “Save Changes” at the bottom of the page (I don’t think you need to actually change any of the settings).
This fixes some php errors by initializing:
settings['settingsbbpl_bbpl_labels_label_like_button_action']
and
settings['settingsbbpl_bbpl_labels_label_like_button_action_done']