The Address book in iOS has IM and Social integrations for redirecting users to the relevant apps, by using kABPerson...
keys. For example the following are used to redirect to a certain contact's profile in relevant app with their respective keys:
Facebook Messanger : kABPersonInstantMessageServiceFacebook
Google Hangouts : kABPersonInstantMessageServiceGoogleTalk
Yahoo Messenger : kABPersonInstantMessageServiceYahoo
Facebook app : kABPersonSocialProfileServiceFacebook
Twitter app : kABPersonSocialProfileServiceTwitter
Is there a way I can use my app's URL Scheme to redirect the user to my own app from inside a contact in the address book?