article_snippet: Scroll down for video .
article_snippet: Saying that IS has 50,000 Twitter accounts, Mr Wainwright told a BBC radio investigation:
article_snippet: His comments follow a report last year into the murder of Fusilier Lee Rigby, which found that Facebook had failed to pass on information that could have prevented His death.
article_snippet: The full interview will be broadcast today at 11am on BBC Radio 5 live.