Who decided what content should be banned? Students, according to McAfee.

As a quick reminder, an array of ISPs, including BT and Sky, uses McAfee as their content banning software (for example blocking child pornography or gambling among other inappropriate content).

PC Pro quoted a security strategist at McAfee's Avert labs, Toralv Dirro, shedding more light on how content is sorted:

"We have crawlers that try to classify websites automatically.

"If there's any doubt, we do have a team of people that take a look at a website and correct a classification if it's necessary."

He also said that there are tricky things when it comes to sorting content, especially pornography.

According to him, a human needs to look at the content and decide what category it would fall under - "if it's more of an erotic website - that's really something that automation couldn't do reliably," Toralv Dirro said.

And this is the fun part - the human crawler's job is most popular amongst students, according to the security strategist.

He summarised:

"Drawing the line between erotic and hardcore pornography is probably the most difficult.

"Another thing is websites that go into extreme left or right side (in terms of politics), but still do news or something like that."