I have some experience of doing this. From my point of view, just keeping diary by oneself is not enough. a lot of people gave up in the middle of the road, even include me :P
so this gives me a lesson.
I have a new idea:
maybe we can group 2-4 members, forms a special group, like nce3 group,wangqiang1 group. use the same material, do the same thing in one thread together, rather than use seperate threads. This will give the group member a better feeling because there's really existing members who have the same goal, and can help each other directly.
limited by 2-4 is referenced by XP-- a software engineering method, pair programming--- two people do one program, improve the communication. I think it's a better way.