BBC bosses are warning journalists their desire to “go viral” on Twitter could be undermining impartiality rules.

The broadcaster’s head of standards, David Jordan, said sometimes reporters did not uphold BBC guidelines on “toxic” social media.

He said some journalists have been disciplined by senior staff over their content amid concerns they have “overstepped the mark”.

The BBC commissioned a review on how reporters and media organisations use websites, which is expected to be published in months.

Jordan is leading the review, and told the Lord Communications and Digital Committee yesterday that impartiality did not always thrive on social media.

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Jordan said: “We have had issues about the use of social media in the BBC where people have not adhered to our standards or have overstepped the mark.

“We have had issues, for example, about tracking the rise of Eurosceptism. Across the BBC, did we do that adequately? No, we didn't.

“We had issues around tracking the growth of concern about immigration.

“I hope we've learned from those experiences and we are applying them now to making sure we do understand what people right across the country in every part of the UK think.”

To address the issue, the corporation has appointed Cardiff University journalism professor Richard Sambrook to help boost impartiality and accuracy online.

Political editor Laura Kuenssberg and journalist Andrew Neil are among those whose social media content has sparked criticism.

Kuenssberg received complaints when during the row about Dominic Cummings, the PM’s top adviser, breaking lockdown rules, she publicly tweeted the Mirror journalist who broke the story suggesting she had her facts wrong.

Jordan went on: “The way social media has developed in recent times - particularly Twitter - has become more adversarial, more argumentative, more combative, more opinionated, more polarised and sometimes actually rather toxic.

“And it can suck people in. The immediacy of it can be alluring, the live dynamics of it can be seductive to some people who find themselves caught up in it, and it can become almost addictive for some of our journalists.

“We have had issues about the use of social media in the BBC where people have not adhered to our standards or have overstepped the mark. We have asked Richard Sambrook to take a good look at what we’re doing and come up with some thoughts about how we should properly use [social media] in this new atmosphere and to the best advantage of the BBC.”