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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Baroness Warsi had previously warned the 'divisive and xenophobic' EU referendum had spurred a surge in racist abuse.
Scattered showers in the north-west, elsewhere mostly dry and bright.
As Labour's turmoil continues and the Tories deal with the fallout of Brexit, the Lib Dems think they have something to offer voters.