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 An article that accused the National Security Agency of impersonating Facebook to spy on U.S. citizens has triggered a denial from the NSA and a reprimand for the U.S. president from CEO Mark Zuckerberg.

The article, which also said the NSA plans to infect millions of PCs with malware, appeared on the website First Look and was co-written by Glenn Greenwald, who shot to prominence last year for a series of articles in the Guardian about classified NSA documents leaked by Edward Snowden.

WhatsApp, the mobile messaging service Facebook just bought for US$19 billion, has several security weaknesses that experts say are worth addressing.

None of the flaws found this week by app security vendor Praetorian are critical. Instead, they represent lapses in best practices for securing mobile apps.

Facebook has retired its @facebook.com e-mail addresses as of Monday, according to Recode. The reason for killing the feature is, unsurprisingly, very few people were using it.

Facebook introduced the e-mail addresses in November 2010 as a way to deliver messages to users' inboxes without needing to use Facebook to originate the message. At the time, Facebook beneficently declared it was "providing an @facebook.com e-mail address to every person on Facebook who wants one."

Facebook is buying WhatsApp, agreeing to pay $19 billion in cash and stock for the popular smartphone messaging service.

Have you opened your birthday gift from Facebook?

This gift isn't for your birthday, though. Facebook marked its 10th year as a company on Tuesday. To celebrate, the social network offered its 1.2 billion users around the world what they're calling Look Back movies, made up of photos they've shared, along with their most popular posts.

Users can see, and share, their movie, which starts with the first photos they shared in the year they joined Facebook. To get your movie, go to facebook.com/lookback/.

If you find a good tactic and it works you stick with it, right? That certainly seems to be the case for the Syrian Electronic Army (SEA). Early in 2013 we watched them phish major media organizations in succession.

More recently they have moved on to more sophisticated techniques, mixing together social engineering, phishing, email hijacking and domain hijacking. Today, it was Facebook's turn. It appears the SEA were able to gain access to an administrative panel at DNS provider MarkMonitor.

Blu-ray discs can apparently be used for more than just movies and console games. Facebook has announced it is developing a prototype for a new data storage system that will be able to use 10,000 Blu-ray discs to store up to a petabyte of data, with the possibility of increasing that space to five petabytes.

Facebook has rewarded Brazilian computer engineer and security researcher Reginaldo Silva with $33,500 (€25,000) for finding and reporting a remote code execution vulnerability. Such security holes are not easy to find these days, so this has been the largest amount of money given by Facebook to a security researcher so far.

Somewhere in Russia an eavesdropper is operating a network of wiretapped nodes at the edge of the Tor anonymity network. And he’s particularly interested in what you’re doing on Facebook.

That’s the conclusion of two researchers who used custom software to test Tor exit nodes for sneaky behavior, in a four-month study published yesterday.

Two Facebook users are suing the company to fight what they say is the company's practice of scanning their personal, private messages to other users so the company can then target personalized on-screen ads to users based on keywords used in their posts.

In a 36-page, three-count lawsuit, plaintiffs Michael Campbell, of Pulaski County, Ark., and Michael Hurley, of North Plains, Ore., allege that Facebook's actions violate several of that state's privacy laws.