Avoid distracting advertisements on your browser and Skype with the following three tips (they can be applied independently):

• Install an Ad-blocker for your web browser. Adblock Plus works very well. Some pages block their content if you have an adblocker installed. Therefore, Adblock Plus can be quickly deactivated/activated with a middle mouseclick on the symbol.
• Deactivate Criteo: Criteo is using tracking cookies to present personalized advertisement. This page explains how to block Criteo cookies
• Block advertisement in Skype by adding Skype to the restricted internet sites: WinKey+R > inetcpl.cpl > Security > Restricted Sites > Sites and then add https://apps.skype.com to the list

You are welcome!