Abstract
According to the literature, there is a research gap regarding digital advertising. This exploratory study focuses on how advertising on the social networks Instagram, Facebook and YouTube, three digital platform giants, is interpreted. Which has the most informative, most interesting, less irritating, and, as a consequence, most effective publicity? We performed a survey, which had 106 answers, and using descriptive statistics we concluded that Instagram and Facebook have better and less irritating publicity than YouTube. On Instagram and Facebook, despite 77,5% and 95,7% (respectively) of the respondents having indicated that they ignore the adverts which are presented, the quantity of people who visit and buy the advertised products is visibly higher, when compared to the numbers registered on YouTube. In contrast with YouTube, the survey sample evaluates Instagram as the platform with the most interesting publicity, in accordance with user preferences. YouTube has less direct and less segmented publicity than Instagram and Facebook.

Abstract
E-commerce facilitates the internationalization of companies at a low cost and enables companies to create a close relationship with their target audience. Often, to increase their sales volume, companies activate recommendation systems in their online stores. This study aims to investigate whether the usage of similar product recommendation systems influences future consumer purchases. Hence, a questionnaire survey was conducted, which had 160 answers. Thus, the factor “moment at which the product suggestions appear” is a variable which has a significant impact regarding online purchases (leading to, for example, impulse purchases). Regarding the form of the suggestions (esthetics, typography or colour), this has the greatest impact of the variables we analysed. Still further, a statistically significant association (chi square test) was found between occupation of the consumer (being a student or having a specialized profession) and making online purchases.

Abstract
With the increasing technological advances that mark society daily, it is essential to analyze, not only the behavior of consumers, but also the behavior of companies facing market changes. It is necessary to distinguish a company that achieves success from one that is not able to succeed, over time. Nokia was the mobile phone market leader for about fourteen years. The launch of the iPhone, by Apple, in 2007, was one of the main reasons for the loss of that leadership. Nokia and its handset division were not able to adapt and demonstrate having dynamic capabilities. They had an excessive focus on their outdated product (their dumbphone), while not taking advantage of their internal innovative product developments to anticipate inevitable change in the market. To provide more depth to the present study a survey was performed and answered by 120 people.

Abstract
Every player in the business world is constantly looking for a competitive advantage which will place them in a leadership position in their particular market. When chosen correctly, lighting may have a significant influence on consumers’ decisions to enter a retail shop or buy a certain item. However, the illumination theme does not only apply to physical purchases, in the retail environment, but also to advertisements and online shopping. Hence, this article aims to study light characteristics and the temperature of light which best emphasize product quality, making them more appealing to the customer. Thus, an online survey was performed, which had 130 answers. After analysing the data, we concluded that a desire exists that retail firms act honestly, and that they should thus use lighting which does not distort the perceived images (which should be as real as possible) of the products which are for sale.

Abstract
The impact of the digital revolution has influenced society significantly in many ways, including with Artificial Intelligence (AI). The advantages and disadvantages of AI and what can be and should be done in order to influence that in a positive way are discussed. The study is based on interviews (ten) and survey answers (from 100 respondents). The survey results show that there is a general concern about the impact of AI in the future (the negative impact on work and related to a general loss of control). Furthermore, more than 50% of the answers lead to the thought that "Humans will learn to use the power of computers to improve their own skills and be ahead of AI". As concerns the interviews, it was interesting to realize that practical courses, such as students studying engineering, were the ones who were afraid of AI instead of the social ones. This may be because the engineering students are the ones who know more about AI so they better realize the possible implications of AI on their future jobs. Another possible reason is that non-engineering students believe that human sensibility needed in their fields of study is more difficult to reproduce by AI machines than technical skills present in other fields of study/jobs.

Abstract
This article was written to study and understand how social networks have changed the way we perceive and create relationships. The exponential increase of social media (SM) has become not only convenient, but also a common habit. It has changed people’s habits and brought a new way of being since the technology era arrived. Although there are several advantages in using these social networks, the uncontrolled use and abuse can be alarming, thus the importance of this research. There are plenty of papers related to the impact of social media on adolescent behaviour and on young people’s academic performance. However, this paper aims to examine the facts and provides a comparison of the effect of social media use between different age sectors: adolescents (between 10 and 17 years old), young adults (18–30), adults (31–45), older adults (46–65) and seniors (+66). In order to explore this issue, an online survey was developed. Using a sample of 358 participants, social media use was analysed by age sectors, focusing on the dependence, habits, the reasons/motivations for people to have these accounts, and how different generations perceive the future of social media. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2020.