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Twitter Inc. has acknowledged that after mobile users tap the "Find friends" feature on its smartphone app, the company downloads users' entire address book, including names, email addresses and phone numbers, and keeps the data on its servers for 18 months. The company also said it plans to update its apps to clarify that user contacts are being transmitted and stored.

The company's current privacy policy does not explicitly disclose that Twitter downloads and stores user address books.

So this means.. if someone has you as a contact and THEY let Twitter scan THEIR contact list, guess where YOUR contact information is located now. Twitter. Even if you don't use Twitter.
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