Video chat service Skype is based on conversation, so it's no surprise that the company announced today the launch of Conversation Ads, which will serve up advertisements during audio calls between non-paying customers.

The ads will appear within the Skype-to-Skype calling window during voice calls between Windows users who do not have Skype Credit or subscriptions, essentially sticking freeloaders with unavoidable ads. Skype said that call quality will remain the same for all users.
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Ads Coming to Skype Audio Calls on Windows | News & Opinion | PCMag.com