As stated in the fifth chapter of the book Social Media and Emerging Economies Technological, Cultural and Economic Implications the number of users on the internet has significantly increased over the last few years as more and more people gain access to the internet. Alongside the growth of the internet is the communication between people, and new media technology. This opens various opportunities varying from social to professional relationships that can be made using the internet. 

With that in mind, as you use these new media and communication technologies to build networks it is only a matter of time until you meet someone who could provide some type of help in your professional carrier. For example, let’s say you are an expert in drawing, and from time to time you share your drawings on Twitter. Someone from the other side of the world views your drawing from their computer and thinks you are very talented. He also knows a friend who is creating a shirt brand and wants a logo for his new company. He gets in contact with you and presents you to his friend who decides to hire you. With access to the internet, humanity has never had so much access to information before, building networks has never been easier. 

Depending on your approach to your PLN it can 100% de relied on to open professional opportunities. It depends on how professional you communicate with others online and how you present yourself on the internet.