I have a similar compulsion—I'll spend a week binging on twitter, posting outlandish amounts of content, yukking it up for the hoi polloi, and then am suddenly struck by a feeling—I simply cannot cope with being seen online; to be visible. I deactivate my account, which of course makes the last ten years of my online output entirely hidden, wrecking all sorts of conversations and occasionally drawing questioning—"are you okay? What happened to your account?"
sometimes one cannot bear to propriocept on the digital savannah