I've certainly gone through phases of posting content of various types on various sites over time. I'll probably get back to posting on my own sites a bit more as one of my main channels went away. But it is easy to let dropping some comments on social media take the place of writing even a short blog post--and that's even assuming you have a blog all set up and everything.

>But he does stay active on Twitter: https://twitter.com/cshirky

Sort of. He hasn't posted anything since last year. [ADDED: I'm wrong. Pinned tweet threw me off.]