The UK government is on the cusp of introducing legislation that will force online platforms to monitor and mitigate the presence and spread of harmful and illegal content, in a regulatory first for big tech.

Affected companies should take note: they will need to prepare for a higher level of transparency and communication with regulators, and larger service providers will require expanded moderation, user verification and research capabilities.

Users should be protected as platforms balance complex competing duties. News publisher content has a carveout, but publishers may experience butterfly effects as the online environment is reshaped.