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Re:Ask HN: How do you keep your address book up to date? by spuiszis on Monday December 10, 2012 @05:41PM (#4901924)
In addition to your typical Outlook, i0S contacts, etc., there are a services that come to mind:

Plaxo (Plaxo.com founded by Sean Parker) has been around for awhile. I used this for some time but have recently discontinued my account.

Brewster (https://www.brewster.com/) is new on the block and I also think Fred Wilson had a blog post on them earlier this year.

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