Final answer:
A primary means of synchronous group communication in discussion forums is a chat room or a live discussion board. This method allows individuals to interact in real-time, similar to the frequent meetings in precolonial Igbo villages. Modern technology facilitates these interactions, allowing primary and secondary group members to communicate synchronously across long distances.
Step-by-step explanation:
A primary means of synchronous group communication used in discussion forums is known as a chat room or a live discussion board. In the context of precolonial Igbo villages, this would translate to frequent meetings and discussions. However, today's equivalent would be the use of technology to create virtual platforms where members can engage in real-time discussions. These platforms serve as modern-day town squares, where people from various primary and secondary groups can interact synchronously, regardless of physical distance. For example, a writers' forum that evolves from a secondary group into something resembling a primary group illustrates the depth of relationships and interactivity possible through such synchronous communication tools.