TwinsOrNot? THE service Microsoft's How-Old.net went viral just hours after the company announced it. Millions of people from all over the world have tried and are trying the service that guesses age from a photo. 
The success of the project was so impressive that Microsoft decided to create special applications for Windows Phone and integrate the service into Bing searches for faster access.
Today the company introduced another similar service hosted on the website TwinsOrNot.net. The new service will rate how similar they are two people from photos.
Just like the first How-Old service, TwinsOrNot.net is hosted on Azure and uses a face recognition API to analyze two different user-defined photos.
The service was developed within a few hours at a hotel in the Czech Republic by Mat Velloso, a Microsoft developer who attended the BUILD developer conference in Prague.
TwinsOrNot.net is currently in beta format, so its features are limited.
