Previously, on Skype, your friends and family had to send you a contact request and wait for you to accept it before you could talk to them. With Skype Preview, this is no longer necessary. Your friends and family can talk to you immediately and you can do the same.
When someone reaches out to you for the first time, you can choose to accept or block messages or calls from that person. Before you accept, they will be restricted to sending you a limited number of messages and any media content is censored to protect you from spam.