ISIS sympathizers threaten Twitter employees with death in retaliation for Twitter's blocking of some Caliphate accounts.

Articles in Quartz and the Atlantic argue that parrying ISIS information operations would require a compelling counter-narrative, which hasn't been easy to find. (The Atlantic sees a precursor to contemporary jihad in European youth's initial reaction to World War One: war would be an annealing fire that hardened their lives into authenticity.)

Not all effective counter-narratives need be high, stern, or austere. They might even be slackly meretricious, as some North Korean dissidents hope. They're using American mass culture (in the form of smuggled movies and television shows) to erode Kim's regime.

Turning to cyber risks more narrowly conceived, Blue Coat Labs warns against "shady" top-level domains. D-Link routers are vulnerable to remote-command injection, and the Angler kit picks up a "tweaked" Keen Team use-after-free exploit.

Mozilla pulls the Superfish cert from Firefox's trusted root store. Tails and Tor both fix security issues.

Three cyber acquisitions are announced: Lookingglass buys CloudShield, Proofpoint acquires Emerging Threats, and Akamai buys Xerocole. In the larger IT marketplace, HP buys Aruba Networks, and NXP Semiconductors buys Freescale.

The US House plans significant cyber hearings this week. The Energy and Commerce Committee goes first with today's session, "Understanding the Cyber Threat and Implications for the 21st Century Economy."

Worries about artificial intelligence are easily dismissed as Skynet fantasy. But there's a real legal concern about AI: the more machines do, the blurrier become lines between professional and product liability.