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
The opt-out system and the great generosity of families like Richard Taylor's brings great hope to those waiting for an organ transplant.
The British prime minister beat the Queen, Mother Teresa and the first female Nobel Prize winner in a new poll.
Katherine Lemansky was the subject of a major police hunt after global uproar at the Facebook post.