Belgian Twitter users responded in an odd way to police requests not to tweet photos of security personnel.
An encrypted chat service with self-destructing messages has blocked accounts associated with ISIS.
Hacktivists determined to disrupt the terror group's online presence could impede government counter-intelligence efforts.
ISIS and other terrorists are able to communicate under the radar of Western intelligence agencies.
In October, news came out that Russian ships were sailing near key transatlantic Internet cables on the ocean floor. Cutting them or secretly wiretapping them could be disastrous. How much trouble would we all be in if those cables were cut?
Britain-based analysts used geo-location data from around 4,000 entries a month to map attacks.
Before and after satellite maps show Boko Haram's horrific campaign of terror.
The US Central Command's Twitter and YouTube accounts were compromised.
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