Here’s the answer in full (edited for some sense of clarity):
Well Rowena, I’m afraid that the Twittersphere is not really my province. What I can say is that I’m informed that Labour have some sort of operation which is very similar to this.
I haven’t followed this Twitter stuff with perhaps the attention that you would like Rowena. I will apprise myself of the detail of this.
But when it comes to trust in politics and the facts of this election, what we need to know… there is one giant fact which we continue to chase down, like The Hunting of the Snark, or the quest for the answer to Fermat’s last theorem, or the riddle of the Sphinx, or the Bermuda Triangle… we still… the one fact that we wish to discover, the one hard crouton fact that we search for in the great minestrone of Labour’s policy on Brexit is what is the position of the leader of the Labour Party on whether he wants to come out of the European Union.
So in short, Johnson answered a question about trust in the Conservative Party by pretending he hadn’t heard about one of the biggest stories of the week and attacking Corbyn.
And for the record, Labour does do fact-checking on Twitter but it doesn't pretend to be an independent organisation while doing it.
The prime minister’s rambling answer did not impress viewers on social media.
@gully_burrows That 80 seconds of incoherent waffling felt like an eternity to watch...
— Republic of Steve 🇪🇺 (@Republic of Steve 🇪🇺)
@gully_burrows Look no further than this short clip for all the obfuscation, blather, denial, disingenuity, distrac… https://t.co/AbsFKiHJZo