Open LinkedIn allows you to open LinkedIn's proprietary URL scheme that you get in your contacts' address book entries when you enable LinkedIn's contact sync.
Easily access your contacts’ LinkedIn profile when you sync your iOS’ contacts with your LinkedIn connections.
Whenever you see "linkedin://" URLs in your address book, you’ll know how annoying it is to not be able to do anything with it. Until now - if you have Open LinkedIn installed, clicking on those pesky LinkedIn URLs will show your contact’s LinkedIn profiles!
Just follow these three simple steps to install Open LinkedIn