The court also said Facebook had not adequately informed members about how it was using their contacts data.
The decision narrows the avenues Facebook and other online services have in expanding their networks.
The case was brought by the Federation of German Consumer Organisations or VZBV, Germanys consumer advocacy association.
Invitation emails from Facebook to people who have not clearly consented to receiving them are an unacceptable nuisance.
The ruling stems from a complaint filed by the VZBV in 2010.
Facebooks appeal was rejected in 2014.
We will study it carefully to assess any impact on our services today, she said.
In addition to Facebook, other services use this form of advertising to attract new users.
They must now probably rethink, he added.
source: www.techworm.net
