I have seen bulk invitation feature in many places such as LinkedIn where you can invite multiple friends to LinkedIn using your gmail (or other email, facebook etc.) address book.
This feature doesn’t seem to exist here. Any plans on this feature? I think this can help a lot for generating critical mass for any forum in a short time.
What LinkedIn does is morally reprehensible, and I will not ever support any feature that asks for your password to another service. That is literally asking for a security breach.
Additionally, this feature could very quickly land you on some spam lists, so I suggest you think hard about whether this Y is the right way to accomplish your X. (XY Problem)
If you still want to do it, I think the rails console is the best way to accomplish this.