Which of the Following Is a Main Characteristic of Social

Which of the following is a main characteristic of social networking sites?

A) They are an online forum where people come to take part in a particular discussion.
B) They offer a secure place to store confidential information.
C) They offer the user a list of other users with whom they share a connection.
D) They offer a list of articles and posts on diverse topics.
E) They provide free information on sexuality education and sexual health.