Twitter is making a big change to its policy in an effort to curb bullying and bad conduct on the social media network.

The company says it is expanding the mute option to allow users to block tweets based on keywords, phrases and contents. The news comes a day after other tech giants Google and Facebook said they are trying to stop the spread of fake news by changing their advertising policies and cutting off sites that produces that story.

Google, Facebook and twitter have been facing criticism over the role they played in the US presidential election by allowing the spread of false and often malicious information that might have swayed voter’s decisions.

Facebook founder Mark Zuckerberg became mired in controversy after some users complained fake news changed the outcome of the US election. He posted details of several projects to “take misinformation seriously”, including methods for stronger detection, Third party verification, Easy reporting and Warnings.

He previously responded to criticism of fake news on Facebook by saying “Of all the content on Facebook, more than 99% of what people see is authentic” and “We’ve been working on this problem for a long time and we take this responsibility seriously.” But he also said that the problems were “complex, both technically and philosophically.” And he noted Facebook did not want to discourage the sharing of opinions or become “arbiters of truth”.

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After this criticism, Google announced to ban fake news sites from using its ad network.

Google said that its advertising tools will soon be closed to websites that promote fake news, a policy that could cut off revenue streams for publications that try to sell hoaxes on platforms like Facebook and Twitter.