I'm building a consumer web application and want to enable my users to invite their friends/contacts from popular email (e.g gmail, yahoo, hotmail) and social networking services to join my service. Can you suggests some products/services you've used in the past that enable this sort of functionality. Can you tell me what you like/don't like about the product/service. Thx in advance for the help!
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This forum is dedicated to programming questions and answers. Since you are asking about a product to do this, and not help in doing it programmatically, this question is off-topic here. – Pascal Cuoq Dec 12 '09 at 18:50
