Porsche is concerned that certain intelligence services may be able to spy on particular information that could be sent through the social sites. Dirk Erat, a Porsche spokesperson, said there's a potential for the company to be exposed to unwanted observation. Erat said,
"These services imply a certain threat potential," and that banning them will be apart of "principal company policy."
Facebook did recently announce it would be making a number of privacy improvements to the site to try and control what information can be seen by 'friends' as well as external users. Although it seems these changes haven't passed the German auto maker's standards.