The editor of one of the world's most successful news websites today raised the prospect of Stephen Fry's Twitter page being regulated.
Martin Clarke, editor of the Daily Mail online, told the Leveson Inquiry into press standards that additional regulation may be a "dagger to the heart" of British online media.
Mr Clarke was talking about the difficulty of regulating web news publishers and bloggers with large audiences.
He said: "You can't slice and dice the internet up into different bits...Stephen Fry has four million followers on Twitter.
"He can reach more people in one hour than I can, so is he going to be regulated?"
The Leveson inquiry will hear today from Detective Chief Inspector Brendan Gilmour. DCI Gilmour worked on the Metropolitan Police's Operation Glade, which looks into police corruption.
The temporary Assistant Chief Constable of Devon and Cornwall police, Russell Middleton will also give evidence. He was involved in Operation Reproof about an officer allegedly supplying private investigators with information from the police national computer.
The editor of the Mail Online is due to give evidence to the Leveson inquiry today. Martin Clarke is a former executive editor for the Daily Mail and Mail on Sunday newspapers. He took over the Mail Online site in 2006, turning it into one of the world's leading online newspapers.