People who get lots of mail need at least 2 and probably 3 accounts. All of the people in the top percentile had at least two, more likely three. Think separation: private mail; business mail; and social network mail, list mail and newsletters.
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If you want a single measure of Internet activity, email flow is the obvious measure.
The median user is getting FOUR email a day.
The top 16% of users in this group are getting over 100 email's a week.
Another 9% are getting between 100 and 70 email's a week.
I also have the advantage of knowing what the other online behaviours of these people are. This single measure is a very good indication of who is and who is not well adapted to being online. My suggested numbers are 15% well engaged, 10% engaged, and the rest are part of the long tail.