The Institute for Democracy and Electoral Assistance (IDEA) has this information:

Political parties and Internet platforms including Facebook, Google, Snapchat and TikTok agree on voluntary rules for Dutch parliamentary elections in a Code of Conduct, the first of its kind in the European Union as countries grapple with issues of election transparency and disinformation in the digital sphere.

In the run-up to Dutch legislative elections taking place on 17 March, 11 out of 13 parliamentary parties and global online platforms (Facebook, Google, Snapchat, TikTok) have made transparency commitments regarding online political advertisements during election campaigns.

Following a request by the Dutch Ministry of the Interior, the drafting process and negotiations of the Code of Conduct were led by the International Institute for Democracy and Electoral Assistance (International IDEA). The Stockholm-based International IDEA is an intergovernmental organization supporting democracy world-wide with expertise on ICT in elections.

Read the full release here.