If the computer opens Internet pages in continuation to facebook, do not worry it is not a virus but only a problem of Skype.
In fact, the last 2 versions of Skype try to access facebook but if your PC is located in a corporate network where it tries facebook is blocked indefinitely the opening of the website, without success.
To resolve this problem you need to select the item displayed by the Skype - Skype Home and then click on "Don’t show Facebook in Skype"