@arasbm This is awesome plugin -- i can not wait to try it when it's ready. thanks.

for many new forums, the hard part is to acquire users. if there is a "Invite" button in the header when user click it it allow user to input a few email address and a message , and invite those user to register. that will be very useful. if nobody work on it, I have interest to give a try. if anybody can give me some advice which plugin i can follow that would be great.