From their blog:
While on a 1:1 audio call, users will see content that could spark additional topics of conversation that are relevant to Skype users and highlight unique and local brand experiences. So, you should think of Conversation Ads as a way for Skype to generate fun interactivity between your circle of friends and family and the brands you care about. Ultimately, we believe this will help make Skype a more engaging and useful place to have your conversations each and every day.
Yeah. I was just thinking to myself how fun it would be to