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 thousand Italian musicians performed Learn To Fly in a bid to bring the Foo Fighters to their city and appear to have won over Dave Grohl.
A cat owner has spoken of his joy at being reunited with his beloved moggy - whose unique cross-eyed condition means he often gets lost.
The 17-year-old, who cannot be named for legal reasons, must pay the billionaire £100 after sending a series of anti-semitic tweets.