Chris,
So, has anyone ever started a group from scratch? How did you get
members to join your groups?
I'm curious as well.
All of the groups I've started (except this one) are mailing lists for people who I know in real life. A family group, some PTA groups, some classmate groups. As such, those all had "natural" and bounded membership. The exception would be my test groups, but those I don't promote either.
As to this group, I sort of assumed it would eventually have a certain amount of cross-over from its sister Yahoo! Group (which I moderate but did not start). That group gained most of its membership, I suspect, by virtue of being one of the four groups listed as "Additional Resources" on Yahoo's help page for moderators.
In the longer term, the size and activity of this group I hope will track the growth of the Groups.io platform, as more people start building more groups.
Pretty much likewise for the other group I moderate, Group_Help. That one is more broadly focused - for members and moderators alike.
/org/groupsio/Group_Help-- Shal