Social media site Twitter said it suspended over 10,000 accounts linked to Islamic State members and their supporters in the span of 24 hours for promoting violence online.
IS users regularly post pictures, some of them gruesome, issue violent threats to the West, and communicate with each other; some use their accounts to help recruit potential members.
Terror experts believe IS has been the most successful terror group in using social media tools to disseminate its propaganda.
Twitter, however, is fighting an uphill battle, as many suspended users simply open a new account, sometimes under the same handle with an added number or letter, sometimes under a different one.
Twitter says it has some 280 million tweeting 500 million times a day.