If they predict

If they not predict

Do not perform polarity analysis

Tumasjan et al., 2010

Gayo-Avello, Metaxas, and Mustafaraj, 2011

Fernández Crespo, 2013

Zarella, 2010

Do perform polarity analysis

http://tweetminster.co.uk, 2010

Montesinos, 2013

Ramadhan, Nurhadryani, and Hermadi, 2014

Tsakalidis et al. 2014