def process_mentions(mentioner)
      handles = extract_handles_from_mentioner(mentioner)
      mentionees = find_mentionees_by_handles(handles)

      mentionees.each do |mentionee|
        if process_before_callbacks(mentioner, mentionee)
          if mentioner.mention(mentionee)
            process_after_callbacks(mentioner, mentionee)
          end
        end
      end
    end
def process_mentions(mentioner)
      handles = extract_handles_from_mentioner(mentioner)
      mentionees = find_mentionees_by_handles(handles)

      mentionees.each do |mentionee|
        if process_before_callbacks(mentioner, mentionee)
          if mentioner.mention(mentionee)
            process_after_callbacks(mentioner, mentionee)
          end
        end
      end
    end
Process mentions

 @param [Mentioner] mentioner - the {Mentioner} to process mentions from