Deputy Labour Leader Harriet Harman called Lord McAlpine's legal action against Twitter users who wrongly linked him to child abuse claims "a wake up call".
The Shadow Culture Secretary told ITV1's The Agenda With Tom Bradby, "It's a reminder that it's [Twitter's] not a no-go zone for the criminal law or the civil law".
"I think Twitter helps with the news. You find out things so much more quickly - that is unless you're the Director General of the BBC," she added.
The Agenda will be broadcast at 10.35pm tonight on ITV1.
More top news
With the Easter holiday is set to begin, millions of Britons planning a getaway may find their travel plans hit by delays and disruption.
Robert Clark has lived at his home for 50 years. 130,000 people have signed a petition to try to keep him there.
As M&S announce the first rise in non-food sales for four years, ITV News' Joel Hills asks are we falling back in love with the retailer?