I thinks it's combination of technological and social aspects. Some non-tech people said to me that they couldn't figure out how to RSVP to Google Calendar inv

I thinks it's combination of technological and social aspects. Some non-tech people said to me that they couldn't figure out how to RSVP to Google Calendar invitation (link is provided in email). Social aspect plays when other people see who and how many people have responded. Some people don't want to RSVP first because they don't what to seem like desperate people sitting at computer all the time. Some people don't want to RSVP because everybody else includes some witty comment and they can't invent anything witty enough. Some people don't want to RSVP 'No' and think that no answering at all is less antagonistic.