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FullContact

FullContact provides you identity resolution for all the disparate pieces of contact information on the web. In short, they keep your contact information current.

How important is your contact list? That is the question FullContact took up and brought an answer to. For anybody who wants to keep their contact lists up-to-date and safe, need FullContact. And I guess that is everybody.

The service keeps you contacts safe and up-to-date by aggregating billions of contact records with various attributes such as quality, frequency and freshness. Read more of this post