Here are the directions according to the founder of the group...
Please post your 140 character (or less) message that you'd like others to tweet about in the Discussion Forum thread "Retweets for the Week".
Example: RT @julieFBT Have u declared the American Cancer Society as the official sponsor of your birthday?
http://budurl.com/ACSMoreBdays
It can be a new blog post, a product, service, worthy cause, sale, promotion, contest, funny video, new website, an upcoming event...I think you get the idea. :) Members can pick and choose which messages they'd like to tweet about to their followers.
Keep in mind if you want others to retweet for you, make sure you retweet for others or this won't work. Also keep in mind that engaging on Twitter is about posting tweets of value to your followers. Evaluate these RT requests and only retweet the ones you feel will add value.
Members may post a brief intro about themselves & their business on the comment wall, but please do not spam members.
Please do not try to sell the members your product or service. Please add this info to your profile on "my page".
Please do not ask for feedback about your blog or business.
Please do not add full blog posts. These are best left on your profile blog.
Please do not add comments or replies reporting which messages you retweeted. Users should simply click on the @userid link on Twitter to see who retweeted for them. This will keep the thread cleaner.
To keep this group as streamlined as possible a post will be deleted, without notification, if it does not adhere to these guidelines.
Let's keep this simple and easy for members to use.