Ask HN : Which contact importer you use to import user's address book?

For one of my web app, I need to let users import contacts from their address book(gmail, yahoo, windows live, facebook etc.), so that they can send them invitations to join site. I googled for existing libraries, saas offerings and found only two good solutions: 1. OpenInvites - It does the job well but it uses scraping instead of oAuth. 2. CloudSponge - Not free($25/month) and no support for facebook. Which contact importer you guys are using? Is there any better alternative to these two or I need to develop my own contact importer?