For me, Twitter is where I cement connections with people, HN is often where I feel I can check the pulse on a topic, but LinkedIn, Facebook, and others have no bearing on my professional life.
Facebook, LinkedIn, Instagram and Snapchat serve no utility for a single developer but instead benefits better for an organisation.
If anything, email is my social media.
Abandoned Facebook, LinkedIn, Tumblr, etc, too much noise.
Trying to keep Twitter, but, Twitter keep you on a social bubble, so, HN is best to capture trends.