You may or may have not noticed it, but at the top of the navigation, right after the Home link, there is a link to help you Invite others to TuDiabetes. You can invite people from your Web Mail (Gmail, Yahoo Mail, Hotmail, etc.), type in email addresses directly or upload contacts from your Outlook (Express) or Address Book, as shown here:
Also there are other ways you can help us get the word out about TuDiabetes. Read how you can help promote TuDiabetes online and offline.
Thanks for your help and continued support!