In any industry building a network is essential because it allows you to connect with like minded people, which can essentially grow multiple aspects of your life.
This concept is no different in blogging or social media. Networking is key if you want to survive in this large world of blogging. I found out the hard way years ago how difficult it was when you don't make an effort to build your network. This resulted in stunted growth for me and blogging became a pretty lonely place.