Dorries outlined the possible scale of the punishments available as part of the forthcoming Online Safety Bill after concerns over the behaviour of some tech firms were raised in the House of Commons.
The legislation is expected to force the biggest operators, such as Meta – formerly Facebook – and Google, to abide by a duty of care to users.
All activity seen on these platforms will be overseen by Ofcom as the new regulator for the sector.
Conservative MP Saqib Bhatti (Meriden) said: “Last year, I wrote to five of the major social media companies with 50 of my colleagues, calling for meaningful change, asking them to recognise their moral duty to make this change.
“Only three of the five social media companies even bothered to reply to that piece of correspondence, which concerns me they are not taking this matter seriously enough.”
Bhatti addressed Dorries about the matter and sought confirmation that she will be characteristically robust about making...