I'd join this.

It's asking for scary permissions:

> Read Tweets from your timeline.

> See who you follow, and follow new people.

> Update your profile.

> Post Tweets for you.

Please, consider adding more options, or explaining how you use those permissions. (For example, you can do what you like to my facebook wall.)

EDIT: Lack of public posting is an interesting choice. It doesn't feel like much of a community. I can see that public comments risks undue negativity or aggressive feedback.