I used to but it just got in the way of actually reading the book so I stopped.
I found it jarring and it was causing a disconnect between me and the book.
I know that I blog about books, and post reviews, but I'm not a professional reader.
I'm a recreational one who shares her thoughts.
I care more about the impression a book left on me and whether I was entertained than critically analyzing a text page by page...
I limit myself to just highlighting quotes as I read now and then writing a rough review once I'm finished which I'll spiff up a bit later before posting.