What is sentiment analysis and how can it be used in business? Our case study

7 May 2021 | 11 min read

Behind every piece of verbal communication, there is a set of emotional messages, which are crucial for understanding the meaning hiding behind the text. That’s where sentiment analysis, also called opinion mining or emotion detection, comes in. It is used to determine the opinion, emotions and attitude of a writer. 

In this article, we’re going to take a closer look at one of the tool’s business applications: social media analysis used to check the reception of a certain topic or the writer’s opinion orientation. We’ll do so by analysing the examples of sentiment analysis applications for Twitter-based data using two NLP frameworks.

Ready to explore how technology can help to understand what hides behind user opinions? Let’s dive in! 

What is Natural Language Processing?

NLP is the automatic manipulation and understanding of written or spoken text. It intersects such fields as linguistics and artificial intelligence. It originated in the previous century in the ’50s from Alan Turing’s paper in which he introduced an Artificial Intelligence-related concept by asking a question: “Can machines think”?

Throughout the last 70 years, this concept has rapidly evolved into tangible methods and automated tools capable of quickly answering quite complicated questions, mimicking human reactions. 

The benefits of NLP for business

Now you may and should ask: what does this have in common with my business and its performance? The short answer is simple: a lot! 

First of all, NLP methods have a wide range of business applications. They can be used to monitor customers, user behaviour and opinions from customer feedback, as well as survey, social media posts, chatbot conversations, and emails.

The benefits NLP can bring are many. We can learn more about user needs, tailor products and services, improve customer service, react in real-time and over time on social media. Thanks to sentiment analysis, we can also detect fake news, delete offensive comments, and therefore prevent cyberbullying.

How can we deliver sentiment analysis solutions?

There are a lot of automatic and business-friendly NLP frameworks. But how to know which one is the best for you? Let’s go through the overview of those most suitable for sentiment analysis. 

From a technical point of view, we can implement Sentiment Analysis as SaaS or open-source APIs. SaaS frameworks are ready to use and do not need advanced programming skills. Open-source packages, on the other hand, are flexible, have much more customisation possibilities, are free to use and can be deployed on-premise. 

Amazon Comprehend

Amazon Comprehend is a cloud SaaS solution that uses NLP to extract insights about the content of documents. It develops insights by recognising the entities, key phrases, language, sentiments, and other common elements in a document. 

For example, by using Amazon Comprehend you can search social networking feeds for mentions of products or scan an entire document repository for key phrases.

Amazon Comprehend determines the emotional sentiment of a document: it can be positive, neutral, negative, or mixed. This solution is a cloud service that can work serverless. For more AWS Machine Learning solutions, please see our article.

More NLP-based frameworks

Apart from Amazon Comprehend, there are several open-source frameworks available,  such as  Python’s NLTK, TextBlob, Gensim, SpaCy, Core NLP, that can be applicable for sentiment detection.

NLTK is probably the most popular and as it was released the earliest. For the purposes of our case study, we used TextBlob: a Python library for processing textual data that is based on NLTK. It provides a simple API for diving into common NLP tasks such as part-of-speech tagging, noun phrase extraction, sentiment analysis, classification, translation, and more. 

TextBlob has a rule-based integrated sentiment analysis function with two properties – subjectivity and polarity. Polarity has a continuous value in a range from -1 to 1, where -1 is a negative sentiment, +1 positive and around 0 is neutral. Subjectivity is in a range from 0 to 1 where 0 is very objective and 1 very subjective sentiment.

Our case study: sentiments hidden in tweets

Twitter has become one of the most important sources of opinion forming, and it is a great source of concise text that expresses emotions, which makes it perfect for sentiment analysis. Let’s see how it’s done!

We started with data collection. Our data set consisted of about 2,200 tweets pulled out using Tweepy – a Python library for accessing the Twitter API. Relevant tweets were collected using Search API. 

As an example, we took social media posts from a well-recognised and emotion-inducing brand – Tesla. We wanted to know what are sentiments hidden behind tweets hashtagged with the “tesla” keyword.

We looked at tweets from 18 days, between 10 and 28 December 2020 and included only original tweets (retweets, replies and links were excluded) in English. The information extracted was: 

  • text of the tweets
  • the date and time they were posted
  • the number of likes and retweets
  • the tweets’ source (different devices and bots)
  • the location (country) 

We performed sentiment analysis using both Amazon Comprehend and Python TextBlob APIs. With the information we gathered, we could check how popular the tweets were and what was the sentiment behind them.

By using different filters, we could also and examine only e.g., negative sentiment or most popular tweets, do some aggregations per a specific time period, browse data by location or by the device from which it was posted.

The power of visuals

Looking at raw tweets data and analysis outcomes is time-consuming, might be confusing and may cause key information oversight or misinterpretation. At-glance reporting together with adequate visualisation techniques helps to understand business data better, by showing only the relevant information and reducing the clutter and getting actionable insights. 

For the purpose of this article, we have used Power BI to customize and summarise outcomes. We put the information about the tweets and both sentiment analysis methods results on three separate dashboards.

In the tweets summary, dashboards showed how much people talked about the brand by including the number of likes and retweets, the device from which it was posted and location.

Tweets summary
Dashboard 1.
TextBlob-based Sentiment Analysis Summary
Dashboard 2.
Amazon Comprehend-based Sentiment Analysis Summary
Dashboard 3.

Key findings  

The overall tweets summary shows that in general they have a positive reception and are rather objective.

Both polarity and subjectivity had normal-like distribution, which means that there were a limited number of extremely negative or positive posts in TextBlob outcomes. The same results were visible in Amazon Comprehend results – the great majority of tweets were classified as neutral.

In the next two dashboards with sentiment summary, the main functionalities are date lookups, the ability to filter on polarity values or categories, select specific tweets in the browser and display sentiment mean values.

What can we say about the posted tweets?

  • Most tweets were posted using mobile devices, both for Android and iPhones (65%). The Twitter Web App was used for 24% of analysed tweets. About 4% were posted using bots. Looking at the average polarity, we can say that only these posts with unavailable sources were slightly negative. 
  • When looking at the timeline we can see that December 18 was the day with the highest amount of tweets, more than 200. This is most likely due to the fact that it was the last trading day for investors before Tesla officially was added to the S&P 500 index on Monday, December 21.
  • Regarding the tweets’ location, it looks like the USA and Canada have the most active tweeters. However, the sample was so small that we can tell much about location distribution. This is just an example of how presenting data on a map makes it easier to understand.


In this post, we showed two sentiment analysis packages. TextBlob, an open-source Python library and Amazon Comprehend cloud-based SaaS. We also presented their outcomes on a dashboard in a user-friendly way. We hope you enjoyed the article and found the information useful!

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