Andy Murray's Wimbledon victory beats Prince George, Alex Ferguson and Margaret Thatcher to be biggest UK talking point on Facebook in 2013.
Celebrities who use social media to tell fans what they are doing can not expect to have a private life, according to Daniel Radcliffe.
Prime Minister David Cameron branded Facebook 'irresponsible' after it lifted a ban on users posting violent videos including beheadings.
MPs have told Twitter that it needs to make it easier for users to report abusive messages as the social media site faced questions from the Culture, Media and Sport Committee over 'trolling' on the site.
Conservative MP Conor Burns said none of his colleagues on the Committee were aware of the reporting system.
We have twitter at Culture Committee. They are heralding the reporting abuse facility. No twitter users here can find it. Any suggestions?
Labour former culture secretary Ben Bradshaw questioned whether the site's procedures for dealing with abuse were rapid enough:
"How can we have confidence, when they are very unhappy with the speed with which you responded to the abuse they suffered, that ordinary people who don't have that level of profile and voice are having their reports taken seriously and dealt with quickly enough?".
Twitter's public policy director, Sinead McSweeney, insisted improvements had been made to the reporting function since Labour MP Stella Creasy and campaigner Caroline Criado-Perez were subjected to abuse in July.
Parents are failing to check their children's phones in the fear of being too intrusive, a new report has found.
Are Parents In The Picture?, commissioned by Virtual College’s Safeguarding Children e-Academy and Pace, questioned 750 parents and 945 professionals including police, teachers and social workers.
Many of the parents interviewed said that despite being aware of the potential dangers, they failed to monitor their children's phones in the fear of appearing too intrusive.
The research, by YouGov, found only 46 per cent filtered their child’s internet access, while just 24 per cent admitted checking text messages and 18 per cent checking phone contact lists.
More than 60 per cent of police officers and social workers feel that parents do not understand exploitation, with many calling for a national debate over how much privacy children are given.
Sinead McSweeney, Twitter's director of public policy, will face MPs today during anti-bullying week in the UK.
Facebook and Twitter executives will be grilled by MPs today amid mounting pressure on the companies to do more to tackle online bullying and abuse.
- A poll in November found a quarter of children aged 11-12 had been upset by bullying or trolling on social media
- Celebrity chef Jamie Oliver said he had banned his daughters from social media because he was afraid they would be bullied
- In October an anti-bullying charity found that 69% of young people had been cyberbullied
Senior executives from Facebook and Twitter are due to give evidence to the Culture, Media and Sport Committee today.
Simon Milner, Facebook's policy director UK and Ireland and Sinead McSweeney, Twitter's director of public policy, will answer questions as part of the committee's online safety enquiry.
MPs due to attend include Home Office Minister Damian Green, Culture Minister Ed Vaizey and Claire Perry, the PM's adviser on preventing the commercialisation and sexualisation of childhood.
The founder of increasingly popular photo-sharing app Snapchat has turned down a $3bn (£1.87bn) takeover offer from Facebook, according to a report in the Wall Street Journal.
The smartphone app, co-founded by American Evan Spiegel for a project at Stanford University, allows millions of users - predominantly teenagers - to share photographs which destroy themselves after a few seconds.
Spiegel is hoping that Snapchat, which currently has no charges or advertisements, will be valued at more than $4bn when he considers acquisition offers next year, the report said.
Facebook bought image-sharing rival Instagram for $1bn in 2012.
- Facebook floated in May last year valued at $100bn, but its share price fell sharply - blamed partly on Nasdaq technical issues. Shares have since recovered and the company is now valued at more than $120bn.
- LinkedIn shares soared after its 2011 flotation on the New York Stock Exchange, almost doubling its expected valuation to $8.5bn. Today it is worth more than $26bn.
- Lastminute.com shares slumped after floating in 2000. It was bought out five years later for £577m, less than half the flotation price.
Prime Minister David Cameron said he is "pleased" Facebook has changed its approach after the site removed a video that showed a woman being beheaded.
Mr Cameron wrote on Twitter:
I'm pleased Facebook has changed its approach on beheading videos. The test is now to ensure their policy is robust in protecting children.
Facebook has clarified that it will remove content that "glorifies" violence and said it will take a more "holistic look" at the context surrounding a violent image or video.