A 'selfie' the Prime Minister tweeted of his Ukraine crisis talks with Barack Obama has been widely mocked on the social network.
A resourceful advertising student is trying to get his foot up the career ladder with the help of a promoted tweet on Twitter.
Former footballer and broadcaster Stan Collymore is calling on Twitter to take action after being bombarded by racist abuse.
Some $7 billion (£4bn) has been wiped off the value of Twitter after it released its first set of results as a public company disappointed investors and analysts, sparking a backlash on Wall Street.
Shares plummeted as much as 24% in New York after the figures showed the number of new monthly users on the micro-blogging site fell to nine million, a slowdown from the previous three quarters where it was adding 16 million new users.
Its shares slumped in after-hours trading on Wednesday night and dropped further as US markets opened, even though the firm's revenues more than doubled to a bigger-than-expected $243 million (£149m) in the October to December quarter.
Twitter's share price has plummeted by 23% as it reported a net loss of $645m (£396m) for 2013, just three months after it was listed on the New York Stock Exchange.
The loss was expected by analysts, but slow growth in user numbers was a bigger concern for investors.
Twitter averaged 241 million monthly users in the last quarter of the year, up just 3.8% on the previous quarter.
In its annual earnings report, published last night, it showed its total revenue for last year was $665 million (£407 million), more than double the $316 million £194 million) of 2012.
By the fourth quarter of 2013, the number of monthly Twitter users around the world had increased to 241 million, the newly released figures show, although growth is slowing down.
– Twitter chief executive Dick Costolo
Twitter finished a great year with our strongest financial quarter to date.
We are the only platform that is public, real-time, conversational and widely distributed and I'm excited by the number of initiatives we have under way to further build upon the Twitter experience.
Twitter's public debut on the stock exchange was the most highly anticipated since that of Facebook in May 2012. The San Francisco-based company was launched seven years ago. Last year the company named the UK as its biggest market outside America.
Social network Twitter exceeded Wall Street's earnings and revenue expectations in its first quarter as a public company.
But investors were looking for even more - including faster user growth - and the company's stock dipped as much as 12% in after-hours trading today.
Twitter has reported a net loss of $645 million (£395 million) for last year.
Twitter has posted better than expected results in its first quarter as a public company, reporting $243 million (£149 million) in revenue.
Investors predicted the micro-blogging service to earn $218.2 million, but high user growth pushed the figures up.
Twitter averaged 241 million monthly users, up 30 percent from a year last year.
Lib Dem Chief Secretary to the Treasury Danny Alexander said "Labour's hypocrisy on taxation is breathtaking" after Ed Balls set out the party's economic policy ahead of the 2015 General Election.
Mr Alexander said the shadow chancellor's speech shows the party "have learned nothing from the last few years and would undermine the foundations of Britain's economic recovery" and reintroducing the 50 pence tax rate "wouldn't help".
He said: "In Government they left a system full of loopholes for the wealthy to exploit.
"Thanks to our action in Government to raise capital gains tax, reduce pensions tax relief for the wealthiest, and tackle avoidance, Lib Dems in Government are raising more from those who have the most and making Britain more competitive."
Comedian Bill Bailey has said that Twitter should do more to protect users from "sustained campaigns of abuse", but said people who receive hate messages on social media should "ignore it and people get bored pretty quickly".
Bailey claimed the best way to deal with abusive messages was to "be robust and just ignore any abuse or trolling", as well as to use a feature on the site that blocks unwanted users.
The 50-year-old, who has 1.18 million Twitter followers, told Channel 5 News: "Some of it is horrible. You can see that some people have sustained campaigns of abuse. I think Twitter should do more."
He said that if people are "determined and they've really got it in for you," the abuse may be part of a more sustained campaign.
The Metropolitan Police has released mugshots of the pair who were jailed for sending abusive Twitter messages to feminist campaigner Caroline Criado-Perez.
Isabella Sorley, 23, of Newcastle was sentenced to 12 weeks imprisonment, while 25-year-old John Nimmo, of South Shields, was handed an eight-week sentence.
They were also ordered to pay £800 in compensation for "sending by means of a public electronic communications network messages which are menacing in character."
Moments after issuing a statement about the jail sentence given to her online abusers, Caroline Criado-Perez tweeted that she had reported another Twitter user to the police.
Thanks 4 support. Have obviously reported to the police. Will keep reporting to police & going thru with prosecutions till msg gets across.
However, if you cld not @ me while tackling abusers I'd be really grateful. This is taking me back too much & can't deal with it.
Judge Howard Riddle said the effect of Twitter abuse on feminist campaigner Caroline Criado-Perez had been "life-changing".
The victim describes "panic and fear and horror," he said.
The judge added that online abuse aimed at Stella Creasy had also had a "substantial" impact on the Labour MP, who has had a panic button installed in her home.
– Judge Howard Riddle
The fact that they were anonymous heightened the fear.
The victims had no way of knowing how dangerous the people making the threats were, whether they had just come out of prison, or how to recognise and avoid them if they came across them in public.