Spotify - Map shows when two people play same song at same time
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
SoundCloud - Enjoy music & follow favourite artists
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts