I am wondering what is the concept of the bold part here? although I know what it means. Meanwhile, would you please show me what is the difference in meaning between the italic part and A-- my revised?
A. old and new friends
Social networking is an important part of many people's lives now where massive numbers of people congregate on sites like Facebook and interact with friends old and new, real and virtual.
Thanks. I cannot yet get what is the difference between the following conceptually, or how do they differ from each other here? old/ new/ real / virtual