Facebook has been revealed to keep a log of suspected 'hate agents' which it reportedly vets by tracking users' offline activities.

People who are thought to be endorsing a blacklist of so-called 'designated hate entities' - such as former EDL leader Tommy Robinson, who was booted off the site this year - could result in being labelled a hate agent and banned.

And the social media giant's monitoring of its users' also stretches to activity on other websites and even their private lives, such as whether they have a 'hate symbol' tattoo.

Facebook has been revealed to keep a watch list of suspected 'hate agents' which it reportedly vets by tracking users' offline activities

People who are thought to be endorsing a blacklist of so-called 'designated hate entities' - such as former EDL leader Tommy Robinson, who was booted off the site this year - could result in being labelled a hate agent

These processes are outlined in an internal Facebook document called Hate Agent Policy Review which was leaked by a company insider to Breitbart News.

The outlet claims that this memo lists ex-UKIP MEP candidate Carl Benjamin among Facebook's hate agents.

Earlier today a Facebook spokesperson did not deny the existence of the Hate Agent Policy Review to MailOnline.

The spokesperson said: 'As our Community Standards make clear, we’ve always banned individuals or organizations that promote or engage in violence and hate, regardless of their ideology or motivation.

'The process for evaluating potential violators is extensive and we consider a number of different signals.'

The leaked Hate Agent Police Review document lists UKIP MEP candidate Carl Benjamin among Facebook's hate agents

According to the leaked document, Facebook scans for 'signals' that an account belongs to a potential hate agent.

For example, hate speech signals will flare up if a user makes either three slurs in one appearence, or five slurs over the course of a month.

Breitbart, a conservative-leaning news organisation, has criticised the social media giant in the past for political bias.

But Facebook has insisted that it bans all individuals and organisations engaging in violence or hate, regardless of ideological motivations.

The company also confirmed that their robust decision-making process involves checking their users' activity on other social media sites.