Journalists have reported suffering abuse and attacks, such as being punched, threatened with knives, forcibly detained and subjected to rape and death threats, the Department for Digital, Culture, Media and Sport (DCMS) said.
The YEP's Call It Out campaign has called on social media platforms to take accountability seriously, sharing real-life experiences of online abuse suffered by people in Leeds.
The abuse has left scars on people from all walks of life in the city.
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The YEP's campaign was mentioned by MP Holly Lynch in a debate in parliament last year, where Ms Lynch called social media abuse a "ticking timebomb" which urgently needs addressing with legislation.
Now, Prime Minister Boris Johnson has listened to the concerns shared by the YEP and organisations across the country.
Commitments in the new action plan include training for police officers and journalists, while prosecution services across the UK have reaffirmed their commitment to taking a robust approach to crimes against reporters.
Every police force is to be given access to a designated journalist safety liaison officer, and the National Police Chiefs’ Council has appointed a lead officer to take responsibility for crimes against journalists at a national level.
Meanwhile, DCMS and the Home Office are to launch a call for evidence to build a better understanding of threats and abuse against journalists to take a targeted approach in tackling the issue.
Mr Johnson said: “Freedom of speech and a free press are at the very core of our democracy, and journalists must be able to go about their work without being threatened.
“The cowardly attacks and abuse directed at reporters for simply doing their job cannot continue.
“This action plan is just the start of our work to protect those keeping the public informed, and defend those holding the Government to account.”
A survey of members of the National Union of Journalists (NUJ) in November last year found more than half of respondents had experienced online abuse while nearly a quarter had been physically assaulted or attacked.
As part of the national action plan, Facebook and Twitter have committed to respond promptly to complaints of threats to journalists’ safety online, according to DCMS.
The joint effort by law enforcement, broadcasters, publishers, industry bodies, unions and the Government has been endorsed by the National Committee for the Safety of Journalists.
The Government said the action plan supports wider work ministers are carrying out to uphold freedom of speech, under the forthcoming Online Safety Bill.
Culture Secretary Oliver Dowden said: “Attacks on journalists are not only horrendous for those individuals but an assault on our democracy.
“Today’s action plan will make sure journalists can go about their vital work without fear.”
Ian Murray, executive director of the Society of Editors said: “The action plan recognises the urgency of protecting journalists carrying out their vital role in protecting democracy.
“Due to their role in holding the powerful and those in authority to task journalists attract strong reactions.
“But this should not manifest itself in ways that threaten journalists and their families. This action plan makes that clear.”