http://winaero.com/blog/how-to-disable-ads-in-skype-updated-for-recent-versions/
除了apps.skype.com以外
可以去掉廣告的空間，不會剩下空白
Win+R %appdata%\skype
把profile中config.xml
Change its value from this:
<AdvertPlaceholder>1</AdvertPlaceholder>
to this:
<AdvertPlaceholder>0</AdvertPlaceholder>
話說skype官方論壇可以討論如何去廣告，有點意外阿