Hacker News Poll: Do you select text while reading?

I found a poll over at Hacker News via John Siracusa:

I am surprised at how many people, like me, who select text to highlight what they are reading. Some reasons include tracking your reading position, increasing text contrast, or as an “intra-page” bookmark.

It seems natural for me to highlight as I go and I almost didn’t realize I do this. I wonder if others have noticed it. I don’t think I’ve seen anyone (friends or coworkers) do it…