Now that Anonymous has declared cyberwar against the so-called Islamic State in retaliation for the Paris terrorist attacks, the question becomes: What can the hacker group actually do?
Taking over and shutting down Twitter accounts is a logical first step. But the real prize, experts say, is in fundamentally disrupting the militant group's recruiting mechanism. ISIS pitches its radical Islamist message through e-mail, Web chat, Skype calls and YouTube videos, and more recently it promoted a mobile messaging app called Telegram.
An Anonymous spokesman in a trademark Guy Fawkes mask said in a still unverified YouTube clip that the group "will launch the biggest ever operation" against ISIS, according to transcripts of the French video.
Anonymous, a 12-year-old virtual community that's been linked to hacks on everything from the government of Zimbabwe and Bay Area Rapid Transit to Visa, MasterCard and the Federal Reserve, has proven plenty capable of following through with its threats.