Social network social plugins <p> <strong>Facebook</strong>: We use social plugins of the Facebook.com social network, which is operated by Facebook Inc., 1601 S. California Ave., Palo Alto, CA 94304, USA. The Like button also uses such a social plugin. If such a plugin is called by our users, the user browser establishes a direct connection to the Facebook servers. As a result, the information on which Experteer websites were visited by the user is automatically transmitted to the Facebook server.