Justice Secretary Chris Grayling has warned that Twitter users who libel individuals on the social networking site face the same laws as newspaper editors.
Mr Grayling told MPs, "It is utterly, utterly wrong that anybody should have their name blackened, inappropriately and falsely, on any form of social media".
Speaking after a report on BBC's Newsnight led to Lord McAlpine wrongly being branded a child abuser, the Justice Secretary said he is "as concerned as anybody else about what has taken place over the last two weeks".
"The laws of libel apply equally to what you publish on your Facebook page or Twitter page as they do in a printed form," Mr Grayling said. "Those who are damaged in that way have full legal redress to try and get proper justice".
More top news
A shocking undercover investigation films people who claim to be able to find a fake bride and guarantee a UK marriage visa.
Iconic Irish singer and TV entertainer Val Doonican has died, aged 88.
The BBC is to cut up to 1,000 jobs, including many managerial roles, because of a £150m shortfall in its licence fee income.