I think for marketplace businesses, and when you think about online dating, it's not a social network. It's not a place where you go to talk to people you already know; it's a place you go to interact with someone you've never met before.

When people talk about the impact of mobile dating, everyone focuses on real-time meeting - this idea that my pocket will vibrate every time a hot girl walks by. That's important. But it's not transformative.

Your goal in an online dating profile and in your first message to somebody is to strike up a conversation.

In dating, the question is how many Tinder knockoffs are we going to have, and are any of them going to take off?