An individual joining an interest group for friendship is pursuing while those who gain satisfaction from taking action and pursuing the shared goals of the group are gaining

Solidary incentives and purposive incentives are the correct answers, respectively.

According to the American sociologist Mancur Olson, individuals do NOT join groups for rational means but through incentives. These incentives can be either solidary, material or purposive. Material incentives are understood as economic benefits or opportunities that will come afterwards. Solidary incentives, on the other hand, include companionship, a sense of belonging that will come with the pleasure of associating together. Purposive incentives are related to the ethical beliefs and principles that the person holds.

new communications technology has affected the way social movements are organized because nowadays, social movements rely on social networks and the media to get different people with a similar way of thinking in contact, and thus, get them to mobilize for a greater cause.

individuals only participate in collective action when they feel identified with it. is in this aspect that social media becomes relevant, because it guarantees communication among all individuals and organizes the social actions that are going to be carried out, i.e., the social movements.

in addition, being covered by the media is important to validate the message and make it relevant in the social agenda, as well as to reach more people who can share interests, appealing to public sympathy for their cause.

in conclusion, it is by social networks and social media that social movement is given birth; by connecting different individuals with similar ideas and organizing them to mobilize for a greater cause.