Twitter bosses are to be called before MPs' to explain their response to abuse posted on the social networking website.
A 25-year-old man was arrested today on suspicion of harassment by officers investigating Twitter abuse aimed at Feminist campaigner Caroline Criado-Perez and Labour MP Stella Creasy.
The head of trust and safety at Twitter, Del Harvey, told ITV News that policies were in place to protect users against harassment but agreed it could do more to tackle online abuse.
ITV News UK Editor Lucy Manning reports:
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Sir Bruce Forsyth, Sir Cliff Richard and the Prime Minister have been among those paying tribute to Cilla Black following news of her death.
TV favourite Cilla Black, who has died aged 72, gave viewers a "lorra, lorra laughs" during her long career.
Some rain in the north. Very warm sunshine in the south