Another DDoS Blitz for Twitter

For the second time in less than a week, Twitter has been hit by a distributed denial of service (DDoS) attack. Unlike the first attack last week, the latest cyber assault, which started on Tuesday, has been confined to Twitter so far - Facebook has apparently not been affected. That has led Roger Thompson, chief of research at security vendor AVG Technologies, to speculate the second attack could be linked to the attacks on U.S. and South Korean government Web sites last month. The attacker could be a vigilante who wants to draw attention to the security problems plaguing the Internet, Thompson has speculated.