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Today's Tech: Black Friday madness, Microsoft emergency-patches Windows XP, and the UK government blocks more websites

The 24 hour institutionalised retail frenzy that is Black Friday went off without a hitch today. So long as you don't consider broken bones, stabbings, fist fights and general loss of human dignity over 20 per cent discounts a hitch. The shopping madness saw deals aplenty hit the stores in the US, and we've even had our own spillover of shopping violence here in the UK, courtesy of Walmart-owned Asda.

Microsoft has issued an almost unprecedented warning about a vulnerability in its old operating system, Windows XP, after a flaw was discovered by security researchers at FireEye. The flaw is known as a "local privilege escalation vulnerability," and allows an attacker to slowly increase their power over an infected machine until they are able to inject their own code into its running processes, thereby taking control of the machine completely.

The UK government will order Internet service providers (ISPs) to block access to websites containing extremist content, according to crime and security minister, James Brokenshire. The plans will see ISPs obliged to block content deemed to be too extreme for online publication. But who will get to decide what constitutes "extreme?" The government isn't saying - yet.

A new feature that would allow users to save interesting links inside Facebook for later reading could be in the works, according to leaked mobile screenshots. In the photos, a "Saved" tab with a small bookmark icon sits below "Find Friends" under the apps section of the site. The feature was first discovered by technology blog MyTechSkool, who pointed out how the bookmark button sits next to articles in users' News Feed, allowing them to save interesting stories in one click.

Check back tomorrow for another edition of Today's Tech - our breakdown of the biggest technology and IT news stories of the day.