Many platforms estimate interests based on habits or viewed content. LinkedIn users explicitly tell you their professional interests because they WANT to be found. LinkedIn knows what school, groups and professional events members attend, which gives you important insights into why they are the right candidate for you.
Castanet is one of the few applications that has addressed this market. With this tool, you can import different lists from LinkedIn and then target them in different ways; click on profile, follow, network or by campaign.
