Transport for London has become involved in a war of words on Twitter after telling a frustrated commuter to "leave early" to avoid delays.
A 3D map of buildings in central London has been produced entirely from people's tweets. So who are London's biggest tweeters?
After less than a week as Britain's first youth crime commissioner, Paris Brown has stepped down from her role over Twitter posts.
Two men have been arrested on suspicion of inciting racial hatred following comments made on Twitter after the Tottenham Hotspur versus West Ham United match on 6th October.
Police say the tweets were of an anti-Semitic nature and made reference to Hitler and the gas chambers.
A separate investigation last month also dealt with anti-Semitic tweets relating to the same match. A 55-year-old man was cautioned on for malicious communications.
A man has been arrested this morning in connection with a series of anti-Semitic messages on Twitter. Messages were sent on the day of the Tottenham v West Ham match on 6 October, making reference to the Holocaust and Adolf Hitler.
In addition to the anti-Semitic tweets, police also found messages on the suspect's account that were abusive to and incited violence against Muslims. The Twitter account has since been suspended.
It's emerged David Cameron has been following the exploits of a high-class escort agency on Twitter.
One of the Prime Minister's official accounts was linked to the Carltons of London's feed on the micro-blogging site, technology news website The Register found.
But Downing Street indicated that the agency may have first been followed under Gordon Brown's premiership.
The @Number10gov account is the official Twitter feed for the office of the Prime Minister and automatically followed anyone that chose to follow it until 2009 - while the former Labour leader was in power - when the practice was stopped.
Deputy Commissioner Craig Mackey told members of the Greater London Assembly that the force has seen a rise in crimes linked to online harassment and bullying.
This follows a number of high profile cases of "Twitter trolling", where users of the site are bombarded with threats and abuse.
Mr Mackey said: "We're seeing about 1,500 additional offences reported to us per year. I think it will rise as people become more aware of this."
A feminist campaigner from north London - subjected to rape and death threats on Twitter - has deleted her account. It comes a day after Caroline Criado-Perez raised concerns about the police investigation into abuse.
A spokesman for the Metropolitan Police said:
We are urgently trying to contact the complainant so we can discuss with her the issues that she is raising on social network sites, to once again explain our approach and tactics in this investigation to provide both answers for her and clarity.
A huge amount of evidence, including hundreds of tweets, has been captured by officers and thoroughly examined. This has been a complex and large investigation that has involved the examination of hundreds of messages sent on Twitter.
A number of people have so far been arrested in connection with the complaint, and remain on bail.
The MPS has worked closely with the CPS to ensure that what we are examining and highlighting for prosecution meets a criminal threshold. Officers have been in ongoing dialogue with the complainant since the investigation started. We are mindful of the truly hurtful and distressing impact that receiving such communication can have, however we must be sure to focus our efforts on the things that we and the CPS believe is a crime and can be prosecuted.
Caroline Criado-Perez said:
It's just appalling. I got an email saying 'why don't you go through what you've had' from three users with certain handles. It just shows such insensitivity to someone who's been through so much, I can't believe it. I've spent the afternoon crying just from the sheer awfulness of it.
They wanted me to go through all the Tweets again because of their incompetence. Every time I have to go through it it's reliving it all over again.
A feminist campaigner who was sent a barrage of abusive messages on Twitter, has claimed that police lost evidence that she handed to them.
Caroline Criado-Perez, from north London, was one of a number of women who received deaths threats - and threats of sexual abuse - on the social networking site, after campaigning to have a woman's picture printed on a new banknote.
She says that the police appear to have lost supporting evidence that she had emailed to them.