I'm not inclined to do any of those things in a serious way, much less in a way that I'd call professional. I post on HN sporadically and solely for my own amusement, and I don't know that any employers would find my history here relevant in any way.

I don't really get into the social media aspect of development even when I'm allowed to contribute to open projects, so I doubt I'd be very visible (or very attractive if I were) via any social media outlets. Whether I'm the norm or not, I don't know.

Edited to add: By the way, I do appreciate that somebody's out there trying to help developers be more easily visible for doing such things, so don't take my comments the wrong way. :)