Last year Michael D. Barton published a list of blogs and twitter accounts that “focus on or dabble in the history of science, science and technology studies, etc.” that he was aware of. He’s just posted a link to it on his FB wall, so this must be the latest updated version.
Great work! But did he miss any? Seems like the list below doesn’t include much history of medical science (after all much of medicine is medical science), so hopefully someone with good link collecting instincts could make a similar list for HoMS.