You may wonder what could bring Nicky Morgan, Anna Soubry, David Lammy, Jacob Rees-Mogg and other senior MPs from across parliament together at the moment. Yet they are all sponsoring a bill I’m proposing that will tackle online hate, fake news and radicalisation. It’s because, day-in day-out, whatever side of an argument we are on, we see the pervasive impact of abuse and hate online – and increasingly offline, too.

Social media has given extremists a new tool with which to recruit and radicalise. It is something we are frighteningly unequipped to deal with.

Worryingly, it is on Facebook, which most of us in Britain use, where people are being exposed to extremist material. Instead of small meetings in pubs or obscure websites in the darkest corners of the internet, our favourite social media site is increasingly where hate is cultivated.

Online echo chambers are normalising and allowing extremist views to go viral unchallenged. These views are spread as the cheap thrill of racking up Facebook likes drives behaviour and reinforces a binary worldview. Some people are being groomed unwittingly as unacceptable language is treated as the norm. Others have a more sinister motive.

While in the real world, alternative views would be challenged by voices of decency in the classroom, staffroom, or around the dining-room table, there are no societal norms in the dark crevices of the online world. The impact of these bubbles of hate can be seen, in extreme cases, in terror attacks from radicalised individuals. But we can also see it in the rise of the far right, with Tommy Robinson supporters rampaging through the streets this summer, or in increasing Islamophobia and antisemitism.

Through Facebook groups (essentially forums), extremists can build large audiences. There are many examples of groups that feature anti-Muslim or antisemitic content daily, in an environment which, because critics are removed from the groups, normalises these hateful views. If you see racist images, videos and articles in your feed but not the opposing argument, you might begin to think those views are acceptable and even correct. If you already agree with them, you might be motivated to act.

This is the thinking behind Russia’s interference in the 2016 US presidential election. The Russian Internet Research Agency set up Facebook groups, amassed hundreds of thousands of members, and used them to spread hate and fake news, organise rallies, and attack Hillary Clinton. Most of its output was designed to stoke the country’s racial tensions.

It’s not only racism that is finding a home on Facebook. Marines United was a secret group of 30,000 current and former servicemen in the British armed forces and US Marines. Members posted nude photos of their fellow servicewomen, taken in secret. A whistleblower described the group as “revenge porn, creepy stalker-like photos taken of girls in public, talk about rape”. It is terrifying that the group grew so large before anyone spoke out, and that Facebook did nothing until someone informed the media.

Because these closed forums can be given a “secret” setting, they can be hidden away from everyone but their members. This locks out the police, intelligence services and charities that could otherwise engage with the groups and correct disinformation. This could be particularly crucial with groups where parents are told not to vaccinate their children against diseases.

Despite having the resources to solve the problem, Facebook lacks the will. In fact, at times it actively obstructs those who wish to tackle hate and disinformation. Of course, it is not just Facebook, and the proliferation of online platforms and forums means that the law has been much too slow to catch up with our digital world.

We should educate people to be more resilient and better able to spot fake news and recognise hate, but we must also ensure there are much stronger protections to spread decency and police our online communities. The responsibility to regulate these social media platforms falls on the government. It is past time to act.

That’s why I am introducing a bill in parliament which will do just that. By establishing legal accountability for what’s published in large online forums, I believe we can force those who run these echo chambers to stamp out the evil that is currently so prominent. Social media can be a fantastic way of bringing people together – which is precisely why we need to prevent it being hijacked by those who instead wish to divide.

• Lucy Powell is the Labour and Co-operative MP for Manchester Central