Twitter has claimed that its levels of spam are now reduced to one per cent of all Tweets posted.

Abdur Chowdhury, chief scientist at Twitter, admitted that as the website becomes more popular, more and more spammers are trying to do their thing, and it was constantly battling against spam to improve the Twitter experience.

He said that he was happy to ‘report that it's working'. Writing on the Twitter blog, he said: “While the battle will never be over, we're doing well on the front lines. With help from engineers on our research team, we've moved the percentage of spam flowing through the Twitter network way down - and counting.”

F-Secure CTO Mikko Hypponen warned that phishing attacks increased over the last weekend. Speaking to SC Magazine today, he said: “It has been active in trying to block attacks. With email there is no way to remove a malicious messages but with Twitter they can remove bad Tweets even after they have been sent. Also with the shortening URL service like it is filtering out the spam.”