before_sent:   This paper surveys the work on stance detection  and situates its usage within current opinion mining techniques in social media.
before_sent_with_intent: <meaning-changed>   This paper surveys the work on stance detection  and situates its usage within current opinion mining techniques in social media.
after_sent:  There has been a growing research interest for developing effective methods for stance detection methods varying among multiple communities including natural language processing, web science, and social computing. This paper surveys the work on stance detection and situates its usage within current opinion mining techniques in social media.