Project accountability online?

I’m starting a project. The project doesn’t matter. It could be losing weight, cleaning the house, starting a business or making friends. But the process of the project is often difficult and I don’t have a built-in support group. So I’m looking for a place online where I can post what I’m up to and people can support me and I can support them in their endeavors as well.

Are there places online that are amenable to this?

One suggestion I’ve heard is to go to LiveJournal and post about the project there. Has anyone done this? Does it work?

If you have a big project that’s daunting, who or what keeps you going? For this question, both online and offline resources are of interest to me.

So basically, what are the online and offline resources that you use to keep you going on a project?