Aside from my debilitating addiction to HN, I don't use social media. I have a job, family, large circle of friends, and all the usual attachments to society. I vote and love to debate politics with pretty much anyone interested. How exactly would my attachment to society be improved by more social media? If HN went away tomorrow, would I no longer be a part of society?
I have found fruitful, enjoyable political discussion and social media to be more or less incompatible. Twitter and Facebook work great for the purpose of "rallying the base." Tweeting or sharing the latest polemic showing all your friends how truly liberal or conservative you are doesn't do much to bring in converts. But the political bases in the US are quickly approaching max rallied-ness. From here on out is the actually difficult tasks of changing hearts and minds, and that doesn't happen on social media.
If you care about politics, the further you get from social media the better.