Usually the core CA (target audience) is from 30 to 70% of the audience, depending on the specifics of the project.
Social networks, Targeting, and contextual advertising (CPC) allow you to differentiate the target audience on the basis of targeting and, based on the data obtained, to address information only to those who are interested in it.
Before embarking on a project in social networks, it is necessary to study the target audience in detail, describe it, study its preferences, and then, based on the information obtained, create a customer-oriented project.