Lately there is a new breed of apps which pays its users instead. Perhaps the competition on getting enough users or data has become so stiff, now they are paying you instead to become their users or to gather public data.
Archive | January, 2013 
How To Open LinkedIn Contacts from Your Mac’s Address Book
Do you use LinkedIn’s iOS app to sync your contacts? You’ll get those strange linkedin://#profile/xxxx URLs in your contacts that doesn’t do anything on the Mac. If you have that problem, here is a solution to it.