I love net promoter scores. They are cute, make people feel good about themselves and most importantly they mean nothing in the grand scheme of things.
For those not exactly sure what a "Net Promoter Scores" are, it is a rating companies obtain by asking customers a single question on a 0 to 10 rating scale:
Talk is cheap but action isn't.
If people actually refer you then you know without any hesitation that you are on to something...and if they haven't recommended you to anyone you now have an opening to ask why.