I think it's just that pull to check back all the time that I'm talking about. It's something social media companies engineer for - the more times you check, th

I think it's just that pull to check back all the time that I'm talking about. It's something social media companies engineer for - the more times you check, the more ad you see. So it shouldn't be as strong on HN, but I still feel the pull to check if someone replied, or if anyone upvoted that comment or article I posted.