Which of the following is a characteristic of social networks?

A characteristic of social networks is that they consist of groups that have a common interest or connection. Social networks are fundamentally about building relationships, which can be based on shared activities, interests, or experiences. This commonality brings individuals together, allowing them to interact, share information, and support each other within the network.

While geographical location, family ties, and professional relationships can play a role in social networks, they do not define the entirety of what a social network is. Social networks can transcend geographical barriers and include a variety of different types of relationships, such as friendships, interests, and professional connections, making option B the most comprehensive and accurate description.