If we should transmit data to Facebook for matching purposes, this data is encrypted locally in on the browser and only then sent to Facebook via a secure https connection. This is done solely for the purpose of creating a comparison with the data encrypted in the same way by Facebook.</p> <p>Furthermore, when using the Facebook Pixel, we use the additional function "extended matching" (in this case, data such as telephone numbers, email addresses or Facebook IDs of the users) to create target groups ("Custom Audiences" or "Look Alike Audiences") are transmitted to Facebook (encrypted).