Zuckerberg hearing: Facebook founder attacked by US politicians for site's 'bias' and failure to protect users - as it happened

Carter is focusing on the opioid epidemic. He asks Zuckerberg if he knows about a set of facts about the scale of it. He says he's asking because members have asked about ads for drugs like fentanyl on Facebook – which was mentioned earlier on. Will Zuckerberg at least send someone to meet with representatives to get its help on this.

The same question is asked about evidence from conservation groups that goods from threatened animals are being traded in closed Facebook groups. Zuckerberg says he doesn't know. Carter then says that conservation groups argue the market on Facebook is contributing towards the extinction of elephants.

And now the same question but piracy. Does Zuckerberg know that content creators are worried about? Zuckerberg says that he believes it's been a problem for a long time.

Closing up now. Two more reps left.

Jeff Duncan says he'll give Zuckerberg a copy of the constitution. Why doesn't Facebook give people a similar protection – a rule like the first amendment, which allows people to be sure that the site is a place for all ideas.

Zuckerberg says that there's some kind of speech – like terrorist content – that is protected under the first amendment but which he doesn't want to spread on the internet. "Our general responsibility is to allow the broadest spectrum of free expression we can."

Our final person, and our final four minutes!

Kevin Cramer says he's glad we're not moving towards regulation for Facebook. But he's a little worried about their answers on drugs – what if there was regulation forcing them to find and shut down drug ads, and so on? It's certainly more important to do that than to shut down two conservative woman, he says. (There's another Diamond and Silk reference, even if an oblique one.)

Zuckerberg says he's miscommunicated if it seems like he's not committed to that.

Cramer says that Zuckerberg has suggested that there might be a left-leaning bias because it hires from Silicon Valley, where people tend to be liberal. He says maybe they should hire from somewhere in the middle of the country (maybe in his district..).

As the end approaches, the chairman jokes with Zuckerberg that he might not want to stay around for any more questions? "Several of your staff just passed out behind you."

With that, we're finished. Everyone thanks Zuckerberg for coming along.

Thanks to you, too, for reading and following along.