It depends on your goals, but some sort of networking is pretty much needed, yes.
Most of the things published in journals are not some kind of scriptures to be etched in stone and left there for eternity. No, the entire point of publishing your results is communication. How "successful" you are by whatever metrics is not nearly as important as the fact you are not really advancing science if no one reads your research. Blogs can be questionable, too, but it still widens the outreach. Rubbing shoulders at conferences, giving interviews, just chatting with people helps your research to gain visibility and, ultimately, provide you with much-needed resources to continue and improve.
Doing full-scale public education about your work is even better, but can be incredibly taxing. And some people absolutely overdo self-promotion - as in, it starts being detestable from a fellow researcher perspective, but bureaucrats love it nevertheless. So all in all, it is not an easy task to balance it well, but you should try to find what works for you.
I would not necessarily say you are crippling yourself by not wearing a SMM hat in addition to all the other ones you have, but if your peers constantly find themselves ignorant about your research because you are absent from all the platforms they are getting their feed from, it is time to change it.