There's nothing particularly profound about this, but today I realized that how people know me has changed in the last ten years. The reason, of course, is the internet.
It used to be that nobody but my immediate family knew my middle name. But thanks to its rarity, it became my part of my website and email addresses. Now people who know me are more likely to have my twitter handle than my phone number, and if they do have my number it's more likely to result in a text message than a voice call that shows the name my phone company has on file.
So these days it's only people who know me fairly well who know my last name. That''s not an intentional thing, and it's hardly hidden knowledge, but it reflects the way that my social experience has changed over the years.
As I said, not particularly profound, but I thought it was interesting.