Suffolk singer-songwriter Ed Sheeran has said that online abuse has driven him off Twitter.
The Cambridge academic, Professor Mary Beard, has contacted the police after receiving death threats on Twitter.
Ipswich striker Michael Chopra has quit Twitter after posting a picture of a bag stuffed with money.
The 29-year-old, who has suffered a high- profile gambling addiction, tweeted the picture of a bag full of #20 notes.
The accompanying message read: "Keep tweeting me about being in debt haha love it #cash #skint #lol #lendmeafiver."
Later his account, @MichaelChopra10, which had almost 15,000 followers, disappeared.
An Ipswich Town spokesman said Chopra had made his own decision to close the account, adding that the club encouraged Twitter use but "sometimes banter can be a little over the top".
Chopra revealed the extent of his addiction in 2011, speaking publicly about how he had lost as much as #2 million, spending up to #20,000 a day.
It later emerged that his club had loaned him #250,000 to pay off debts.
The player spent three weeks in the Sporting Chance Clinic last season in an attempt to beat the addiction.
BNP Leader Nick Griffin was unrepentant over his attack on 'evil' equality laws.
The MEP said he was standing up for the UK's quiet Christian majority. He also denied that his tweets had been threatening, saying Mr Morgan and Mr Black had nothing to fear.
A 22-year-old man from Essex has been arrested in connection with alleged racist twitter messages aimed at West Ham striker Carlton Cole.
A Corby man found guilty of sending a menacing tweet has won his challenge against conviction.