I can only say two things:
1) TOO COOL
If you want to invite others to join TuDiabetes, there's many things you can do:
-You can link to TuDiabetes from your blog or your web site.
-You can invite others, through TuDiabetes directly or simply emailing them to let them know about the site.
-You can print flyers give out, like the one Landileigh is showing in the photo. You can download them from this page.