Similar idea is Tastytum (http://www.tastytum.com/), though not much has happened there lately.

I was a "beta tester" host last year, and it worked really well and was a very fun evening. The idea works if you're brave enough to try.

But Tastytum's site also seems a lot friendlier to me, has a less scary name ;) and it doesn't require a FB account. "connecting travellers with locals" just sounds safer than having "strangers" come to your house. :)