Joining is the term used to describe people who become members of interest groups for solidary incentives. Solidary incentives are non-material benefits that individuals receive from being part of a group, such as a sense of belonging, shared values, and social support. People who join interest groups for solidary incentives are seeking to connect with others who share their interests and values, and to be part of a community.
Joining interest groups for solidary incentives can have many benefits. It can provide individuals with a sense of belonging, purpose, and identity. It can also help them to develop new skills, learn about new topics, and make new friends. In addition, joining interest groups can help individuals to make a difference in their communities and the world.