Newspaper headlines: Facebook faces questions and Syria bomb claims
The Facebook data leak involving Cambridge Analytica makes the front page story in many of the papers, and prompts widespread debate about online privacy.
The Financial Times says global pressure on Facebook is mounting over the revelations.
"UK demands answers from Zuckerburg" is the headline in the i. The New York Times says Facebook has built its highly profitable social network off its users, selling advertisements based on their ages, interests and other details. But the scrutiny over the company's vast trove of personal data is taking direct aim at that lucrative formula, it says.
Gaby Hinsliff in the Guardian says this feels like a tipping point. Until now, it's been difficult for many to visualise what the unauthorised use of social media profiles to sway voters might look like in practice, she writes. The risks in letting tech companies plough through our holiday snaps seemed remote. But, she adds, they are not so remote now.
The Sun's lead has another tech company in its sights. According to the paper, a YouTube app for young children showed a video on how to make a gun. It says the four-minute clip, which has been viewed 3.6 million times, was easily accessible on YouTube Kids.
The paper says YouTube has now removed the video from the app. It told the paper: "The YouTube Kids team is made up of parents who care deeply about this.
"We act quickly when videos are brought to our attention."
According to the Daily Mirror's lead, Guernsey is set to become the first place in the British Isles to allow assisted suicide. It says the parliament there is set to vote in May on a proposal to decriminalise it, although the law is not likely to come into force for at least another 18 months after that.
The paper reports that the chief minister Gavin St Pier is backing the proposal to allow assisted dying of terminally ill adults who are mentally competent and have been given six months or less to live. Measures to protect the vulnerable and prevent abuse of the legislation would be at the forefront of the plans, it adds.
Finally, Royal Ascot is renowned for its formal dress code - and this year will be no exception - and if anything, even stricter. According to the Times, event organisers have stressed that all racegoers must adhere to certain guidelines, even if they are not in the Royal Enclosure.
Bardot necklines - named after the French actress who made the off-the-shoulder look famous - will be banned, and fascinators will not be allowed either. For men, plain black and grey top hats will be the only style permitted.
The Sun adds that men who wear shoes without socks will be barred too. The cropped trouser look which exposes the ankles and is favoured by some celebrities, won't be tolerated, it warns.