Artificial intelligence allows you to classify your users based on conversion probabilities and expected customer lifetime value. These predictions are great to make your retargeting smarter, but they also allow you to find prospects, that are similar to the most valued users you have. Preselecting prospects is a great way to make new user acquisition more effective and allows you to bid more on them as they convert better.
In order to do this you create a list of high value users in Google AdWords and populate it via audience stream. Once you have a list with enough users, you can create a similar audience on AdWords and start addressing users similar to your most valued users.
The second option to populate a list is to collect hashed email addresses whenever you can, e.g. on newsletter signups, registrations or purchases. Once you have the hashed email address it can be used to identify users on other networks and upload them as a segment. Just run an export in Webtrekk Q3 and upload the csv to the other platform, e.g. AdWords. This method has the advantage of allowing you to export a great number of users at once instead of sending them one by one via audience stream to the target platform.