I know it's not exactly a blog, but academic publishing in journals has been interesting! It can get you invites to publish all sorts of other things. I think

I know it's not exactly a blog, but academic publishing in journals has been interesting! It can get you invites to publish all sorts of other things. I think in this way success begets success. I've also anonymously written a few small blogs with a couple of popular posts. What's amazed me is that sometimes a simple post with a question can drive consistent views (1-2k/views a week consistently). It hasn't been about the large numbers, but I have met a couple of people who have stumbled across these posts which have turned out to be interesting friendships!