Fed up of not knowing who's calling you? Thanks to Facebook you can now say Hi without worries, as the company has developed Hello, an app capable of telling you who's calling.
Facebook's information at your service.
Avoid unwanted calls from Facebook users
To do so, this application is based on the information gathered by Zuckerberg through the user profiles on this social network. The only setback is that you'll only be able to see the details of the people that are calling you if they're your Facebook contacts. Otherwise, it's impossible.
And what if you were to receive a call from a non-contact? In this case, you can know if you've been blocked by other users.