If you’ve ever lost the contacts from your cell phone and set up a Facebook group or event to reacquire your friends’ phone numbers, NeedNumbers.me may save you a lot of typing.

TechCrunch reported that NeedNumbers.me was the creation of 17-year old Stephen Ou, who developed it in five hours.

NeedNumbers.me will analyze Facebook groups and “automagically” find all of the phone numbers contained within, and then export the data as a vCard contacts file that can be downloaded or emailed, after which the phone numbers can be exported to cell phones.

Readers: Have you ever turned to Facebook to recover lost phone numbers?