**4. Conclusion**

*3.5.2. Retweets*

joy and surprise.

legalized"

and now it's just less illegal."

**Kaci Fennell's placing in Miss Universe**

for carnival 2015 come monday and Tuesday"

each of the four topical issues (**Tables 1**–**4**).

"Jamaica passes law that decriminalizes small amounts of pot. legislation also creates licensing agency to regulate medical"

78 Machine Learning - Advanced Techniques and Emerging Applications

"Jamaica decriminalizes marijuana, reminds rest of world it isn't

"in other words, don't get too crazy. weed wasn't legal before,

"miss jamaica universe kaci fennell will play mass with tribe

**Tweet Polarity**

**Tweet Polarity** "we continue to be proud of kaci fennel" Positive

"miss jamaica kaci fennell 'robbed' of miss universe crown" Negative

**Figure 14.** Sentiment emotion of no-retweets obtained on Barack Obama's visit to Jamaica.

**Decriminalization of marijuana in Jamaica**

The tweets that were retweeted by Twitter users for Barack Obama's visit to Jamaica were of

Sample tweets: This section shows samples of tweets and their sentiment classification for

**Table 1.** Examples of Twitter posts with expressed opinions on the decriminalization of marijuana in Jamaica.

**Table 2.** Examples of Twitter posts with expressed opinions on Kaci Fennell's placing in Miss Universe.

Positive

Neutral

Negative

Neutral

This chapter presented information on how sentiment analysis can be used to extract subjective information from a social media website such as Twitter. It provides researchers with an opportunity to collect deep, rich, readily available qualitative information from a large group of participants in an unobstructed real world environment. Despite several potential uses of sentiment analysis, the literature highlights some general challenges that can be faced when using it with Twitter, such as the noisy nature of Twitter's one hundred and forty (140) character long expressions.
