Do what I did: post to Facebook, and put in your message that you're testing it out and this is just a test post, not an endorsement. Then wait for the email (mine took ~30 mins).
Do this at late at night (like I did) and delete your FB post after you get the email (like I did).
Alternately, you can go the whole +hn route described below. It took longer than the FB route, but at least you're not participating in marketing of a sight-unseen web service.
I think the point is that asking a user to do this (even though they can get around it) is offensive.
"Hey spam your friends and we'll give you free stuff" is starting to get too common.
Do this at late at night (like I did) and delete your FB post after you get the email (like I did).
Alternately, you can go the whole +hn route described below. It took longer than the FB route, but at least you're not participating in marketing of a sight-unseen web service.