(REUTERS) — Facebook has tightened its rules on who can make money from advertising on its network, responding to criticism that it is too simple for providers of fake news and sensational headlines to cash in.

The world’s largest social network implemented the new standards with immediate effect to make it clearer which publishers can earn money on Facebook and with what content.

The new standards coincided with an appearance by Chief Operating Officer Sheryl Sandberg in Germany, one of Facebook’s toughest critics on hate speech and safeguarding privacy.

Note: Read our discussion guidelines before commenting.