A new dating app called Boompi works like Tinder at first blush. It finds matches based on location, and you can swipe left or right to let it know if you're interested or not. Now, here's where it gets iffy: if you're a woman, you can invite your girl friends into a private convo you've been having with a potential date. We're not talking about having an honest-to-goodness group chat -- no, your friends would be totally invisible to the person you're talking to. They can send messages within the convo that the other person wouldn't be able to read. And even those who aren't looking for a date can sign up and go on "Ghost Mode" just to be able to eavesdrop on conversations.