The media regulator has published guidelines designed to make the internet safer for women and girls - and threatened to make it "absolutely clear to the public" which platforms are not adhering to them.
Ofcom says it hopes the measures will make it easier to report and act on online abuse, acknowledging that those processes are currently "soul destroying."
However, they are recommendations rather than legal requirements, with the regulator hoping the threat of platforms being outed for not complying with them will compel them to act.
Critics say it and the government needs to go further they want to make the online world safer.
"Until we have legally enforced mandatory code of practice, we don't think we'll really see a shift in tech platforms taking this issue seriously enough," said Andrea Simon, executive director of the End Violence Against Women Coalition.
