Advertisement come to Skype desktop version.Skype software will use your personally data help serve targeted ads and shared with advertisers,the advertisement will appear at Skype home tab.You can disable this features to prevent Skype using your personally data .
1.Open Skype software and login.
2.Select ‘Tools’ tab > ‘options’.
3.Click ‘Privacy setting’ on left side,then uncheck ‘Allow Skype to use non-personally identifiable information about me when serving third party ads option’ and click ‘Save’.That all.
4.If you can’t notice this option then need upgrade Skype to latest version.