Few rhetorical questions:
* I'm pretty sure everyone agrees that customer-driven development is key, so who were you building this for and why were they interested?
* What are they doing to solve their problem at the moment and how is your solution better?
* What evidence did you have that this was a good idea?
* What evidence do you have now that this is a bad idea?
* Why does it have to be friends - can you facilitate spontaneous meetups with strangers (ideally with similar interests and values)?
* Why does it have to be spontaneous - could it connect people who will agree to meet [sometime today/this week/by the end of month]?
* Why do you "spam" people - why not have people collectively opt-in with a "I'm free" marker (with various [free to anyone|free to friends])? Bonus points if you can align calendars to suggest a free time (why Google doesn't do this I'm not sure).
* Is "spontaneous meetups" the right way to sell the idea? What about [coffee-with-interesting-people/speed-dating-in-your-lunch-hour/try-something-new-every-week/never-eat-alone-again/get-fit-with-strangers]?