This seems to be the nature of internet groups in general... most people just don't have the ability to commit to something for long term with no external incentives and weak social ties. I've tried numerous colearning, masterminds, etc. and it's always a struggle.

Even my coaching clients who I give twenty bucks to every time they make a meeting often take 2-3 MONTHS before they can start to do this with anything resembling consistetency.

That being said, here's what I've found helps:

1. Text reminders 15 minutes before every meeting to every person who should show up.
2. Create carrots and sticks using beeminder, habitrpg, or lift as a group.
3. Ping participants through facebook or text one or two times throughout the week with something interesting related to the topic of the group to keep the group top of mind.
4. Create real life bonds otuside of the "let's talk about what we learned" dynamic.