Germany says Facebook can’t link apps together

BERLIN — Facebook is pushing back against a German ruling that could make it harder for the company to combine data from all the services it runs in order to target ads even more precisely.

Thursday’s ruling, though aimed at current practices, hints at potential troubles ahead if Facebook follows through with plans to integrate the messaging functions of Whatsapp, Instagram and Messenger as early as next year. German antitrust authorities ruled Thursday that Facebook was exploiting its dominance in social media to force users to share data from other Facebook-owned services like Whatsapp and Instagram, as well as third-party websites.

The Federal Cartel Office isn’t contesting Facebook’s use of customer data to target ads on the main Facebook service. Rather, the ruling said Facebook should have to get permission separately before using customer data from other apps and websites to do so.

Facebook, which plans to appeal, currently collects data on users’ activities on Facebook and the other apps it owns, along with third-party websites. So, what someone views, likes or shares on Instagram — or the broader web — could be used to show that person an ad on Facebook. Facebook also has been moving to further integrate Whatsapp and Instagram into its main service after initially promising to keep both as stand-alone companies when it bought them.