At Wacktrap, it’s not only important for members to be able to communicate quickly and easily, it’s vital. Your privacy [1] is important. So when you use Wacktrap Messaging [2], all personal info, including email address, remains hidden from both parties. You wont' see theirs, and they won't see yours.
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Links:
[1] http://www.wacktrap.com/privacy
[2] http://www.wacktrap.com/faq/how-do-i-contact-another-user-through-wacktrap-messaging
[3] http://www.wacktrap.com/faqs/keeping-it-safe