A subscriber count on your site works great as social proof. It shows that other people cared enough to signup and that it is ok for you to do the same.
But once you are subscribed, this number loses much of its meaning. The Get Storied newsletter found a way to use this number to strengthen their relationship with existing subscribers. In every mail, they show how the tribe has grown. It makes me really feel like there are other people that care. Plus it works again as social proof if people forward the mail.
|Get Storified newsletter|
[Big welcome to 89 new members of the tribe.You now join over 8,754 subscribers of storytelling mojo.]