It's not just the number of users. It's that people who were heavy Reader users are particularly valuable nodes in a network like Google+. They are more likely to draw other people to Google+ than the average user since they curate more content than the average user.
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It's not just the number of users. It's that people who were heavy Reader users are particularly valuable nodes in a network like Google+. They are more likely to draw other people to Google+ than the average user since they curate more content than the average user.