It's a legitimate business called Passport Unlimited.  Similar to pogo card but for much nicer restaurants and you don't have a limit on how many times you can use it in a year at those restaurants.  (One card per 2 people at a table-basically a but one get one free situation unless the restaurant has it otherwise noted).

We've used it and if you sign up 3 new people, the following year's card is free to you.