Yes, I felt sufficiently sad to look him up and see if I could connect with him elsewhere but he seems to have abandoned all his social media platforms. I did try to engage with him in recent times and watched a TED talk he did a couple of weeks ago, then commented on it, but he didn't reply. Didn't seem to be interested in my engagement, which probably doesn't help his visibility on the platform. I think you're more likely to be recommended stories by people you've recently engaged with... possibly both ways. But he said he wasn't getting the same engagement as he used to, then didn't respond when I made the effort to check things out. I guess he'd lost interest by then. I liked him though. Good guy.