Most communities have relatively few active members.
By active, we mean people who have made a contribution within the past month.
I briefly polled attendees at the CMXSummit, the average was between 500 to 1000. I think that's above average generally.
That's still a lot of activity. If the average member makes 3 to 5 posts per month, that's some 1500 to 5000 posts per month (or 16 to 167 posts per day).
This means every active member is precious. If you increase the number of active members by just 3 a day, that means 100% growth in a year for most communities.
You can't welcome 100 new members every day. It's worthwhile, however, to reach out to just a few members a day – especially after they've made their first contribution. Just a few members every day leads to big results.
For huge communities, this won't be a worthwhile activity. However, most of us aren't managing huge communities. This is the easiest way to increase the level of activity in a community.
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