Note: KeepandShare provides your invitees with an initial default username based on their email address, but they are free to choose their own username the first time that they log in. So don't worry group leaders, your friends will be able to choose their own user names. All you have to do is type in their email addresses into the Invite a Friend command
As an added convenience, your friends' accounts and yours will be automatically linked via your Friends lists, making it easy to share information with each other.