Forum Moderators: phranque
It's a membership site and often within a very short time the recipient joins up via free membership and thus to the Newsletter mailing list. Occasionally when a specific product is recommended and the recipient buys within a short time - I don't really monitor it closely enough to know of others buy or join after a longer period.
There is a facility for people to add a short message when sending to a friend and they can be useful reading - pointing out things people particularly, a sort of very non-scientific feedback from users.
FWIW, I really like the features of the free CGI referral script from BigNoseBird.com. It takes some tweaking to set it up but it has almost no effect on page load time, unlike some remotely hosted TAF's I've seen.
I find that .5 to 2% of my traffic uses it. I edited the script so that it writes to a flat file db, as well as send me notification. People seem to be sending articles to their moms and friends.
It's word of mouth- possibly the best endorsement you can get.