Twitter hit by worm attack for fourth time in three days
A "worm" spreading spam messages promoting another website was first introduced into Twitter in the early hours of Saturday.
Despite efforts to curb the virus, Twitter was hit by a second, more intense, bout of attacks later in the day and another early on Sunday.
Twitter then announced early on Monday that it was facing a new "manifestation" of the worm. Messages advised users not to click on links until the problem was rectified. The website emphasised that no sensitive information such as passwords or telephone numbers had been compromised and suggested it would take legal action against the perpetrators.
