Buyer Intent Data Providers Resources

I find that sometimes the contacts found through this service are not accurate and can mislead the salesperson in charge of reaching out to them.

Are there going to be more complex and 'smarter' ways that InsideView will offer up its insights? ie a cookied user is served up particular content on facebook or google, can IV reach similar levels of tracking etc Or at least curate content based on a person's behaviors? (example: 'this user is Very Active/somewhat active/not active on LI, so we'd recommend LI as a good/medium/bad source to prospect them')

There are plenty of business intelligence/account data tools in the marketplace. I'm curious as to how the data presented in Priority Engine/Tech Target is vetted and validated to ensure it is actionable; that it is connecting companies searching for solutions to sellers with solutions.