I'm also an anti-facebooker. I had it for a while but completely deactivated my account about 5 years ago. I don't do twitter or any of the other mainstream social media apps. SR is my main online communication tool.
Not every fad is a healthy one in my opinion, and while I understand that social media CAN be used constructively, the majority if what is out there is simply a waste of time IMHO. Not to mention all the stupid/risky things I did while I was drunk online.