Twitter bosses have refused to take action over half a million pornographic images that are posted on its site each day, despite growing fears that children are being exposed to them.
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Pornographers are now said to be "cynically" using the social network to target the young, but because the website's not classed as pornographic, the images posted to Twitter can be seen even in households where child internet filters are in place, say campaigners.
Senior MPs have now claimed that those in charge at Twitter have resisted calls to block or filter this sort of content on their website.
Speaking to the Mail Online, a one NP said that Twitter bosses have snubbed a meeting with Government ministers on how best to tackle internet porn.
They failed to send anyone along to the meeting and instead offered to have a member of staff based in Dublin "phone in".
The summit was agreed to by other major internet companies including Google and Facebook, and the event was chaired by Culture Minister Ed Vaizey.
Former shadow culture minister and current Labour MP Helen Goodman last night stated that Twitter was failing to take the "cynical" children targeting pornographers using their website seriously.
She said: "Neither Twitter nor Tumblr could be bothered to send anybody to a meeting with a government minister.
"I think [online porn] is a really serious problem but I don't think they take it seriously."
She went on to say there was a clear problem with the pornographers being able to take advantage of the site, by sidestepping internet controls.
It's now thought there are more pictures of porn on Twitter than there are of pets, but unlike other websites including YouTube and Facebook, the company doesn't have a policy of blocking such images.
John Carr of the UK Council for Child Internet Safety has commented: "We know that exposure to porn has damaging effects on many young children, and yet it is freely available on Twitter.
"Twitter has got a huge responsibility and it's failing to live up to it."
A million Twitter accounts in the UK alone are thought to be those of children.