Happn- its a good concept where you can connect people and make friends whoever you pass by or near by you.App is well designed and very User friendly designed.It has special features where you can select your interest ( man, woman) and you will get searches accordingly. Then you can like the photos of the person you interested. And actually say hi to him/her.I am using this app since last one month, and didn’t find any valid contact on it. I think its a waste and useless app with a good concept.