推荐一个Bump，交换通讯录信息的小软件，支持iphone和android

两个人只要在各自的手机上打开bump，把手机往一起轻轻一碰，就能得到对方的通讯录信息
原理在此,官网在 http://bu.mp/

Q: How does Bump work?

There are two parts to Bumptm: the app running on your device and a smart matching algorithm running on our servers in the cloud. The app on your phone uses the phone's sensors to literally "feel" the bump, and it sends that info up to the cloud. The matching algorithm listens to the bumps from phones around the world and pairs up phones that felt the same bump. Then we just route information between the two phones in each pair.

Q: No way. What if somebody else bumps at the same time?

Way. We use various techniques to limit the pool of potential matches, including location information and characteristics of the bump event. If you are bumping in a particularly dense area (ex, at a conference), and we cannot resolve a unique match after a single bump, we'll just ask you to bump again. Our CTO has a PhD in Quantum Mechanics and can show the math behind that, but we suggest downloading Bump and trying it yourself!