"Your Contact is now on Wakoopa!" notification to people who send Invites.

After sending invites, and people accept and create a Wakoopa account, the Wakoopa system should notify the person who sent those invites that their contacts are now on Wakoopa.

Here's a few simple ways:

1) If someone creates a Wakoopa account with an email that an invitation was sent to, the system should realize this and send a "One of your contacts is now on Wakoopa!" notice to the person who sent the invitation.

2) People who make new accounts could have an initial welcome page with a very obvious button to send the notice upon making a new account, if they created the account via an invite link.

3) There could be a "Add my Inviter as a Contact" button, or a "Thank/Notify my Inviter" button after signing up for a new account, possibly with an email entry textbox.