COLOGNE, Germany (Reuters) – Facebook said on Wednesday it would introduce tougher rules on who can make money from advertising on its network, responding to criticism that it makes it too easy for providers of fake news and sensational headlines to cash in.

With immediate effect, the world’s largest social network will launch new standards to provide clearer guidance on which publishers are eligible to earn money on Facebook and with what content, Senior Vice President for Global Marketing Solutions Carolyn Everson said in a blog post.

These standards would apply to ad placements where context could matter, Everson wrote in the post, timed to coincide with an appearance on Wednesday by Facebook’s Chief Operating Officer Sheryl Sandberg at dmexco, a major digital marketing gathering in Cologne, Germany.

Germany is one of Facebook’s toughest critics on hate speech and privacy. Its parliament passed a law in June to fine social media networks up to 50 million euros ($60 million) if they fail to remove hateful postings promptly.

(Reporting by Douglas Busvine; Editing by Georgina Prodhan)