Let's just remember that most Internet services nowadays measure their traffic as "7-day actives" and sometimes "30-day actives." (Maybe for Twitter it's "daily

Let's just remember that most Internet services nowadays measure their traffic as "7-day actives" and sometimes "30-day actives." (Maybe for Twitter it's "daily actives"?) That's a way of distinguishing people who are just signed up from those who've actually done something in the last N days. I doubt that either the Internet or the BBS's have those numbers for 1990 or thereabouts.