Aka GrubWithUs Residential. You have a big challenge because eating dinner with someone at their home is really intimate. I wouldn't start with photo sharing-- you need to start working on the dinner mechanics right away. Go low tech. Pick a single city, find a couple people willing to host, then send out invitations through existing social connections. Maybe get people to commit to 5 dinners up front for $100. I would also look at having a fundraising component (25% to charity?) because now the dinner can be ABOUT something. You can't just get a bunch of random people together and hope the conversation works out, you need some common cause or interest to act as social lubricant.