Solution

The correct answer is Most of them are directed network..

Key Points

• Most social networks are undirected. This means that if person A is connected to person B, person B is also connected to person A, representing mutual relationships.
• Directed networks represent relationships where the connection is one-way, such as Twitter where one user can follow another without reciprocation. However, this is less common in general social networks.

Additional Information

• Degree distribution follows scale free: In social networks, a few nodes (people) have a very high number of connections (hubs), while most have a few, following a power-law distribution.
• Average shortest path lengths are shorter in connected networks: This means that in a well-connected social network, the average number of steps needed to connect any two nodes is relatively small, reflecting the "six degrees of separation" concept.
• Follows small world property: Social networks exhibit the small world property, which indicates that most nodes can be reached from every other by a small number of steps.