When I send my friends invites, it would be great if I could write a personalized message and title. My friends don't know my username on HB, so they could see the message, think it's spam and ignore it.

A personalized message and title would really help get them to read the email and then hopefully join hellobee.

If you can't do that, can you put a field where we can insert my name?

So instead of the subject of the email be...

"bluestriped bee" invites you to check out Hellobee - a new parenting community

I could insert my name where my username is.