Hot on the heels of the $19 billion acquisition of instant messaging platform WhatsApp, Facebook today announced its latest purchase.

The latest buy, however, has on the face of it nothing to do with Facebook's core social networking business.

Mark Zuckerberg's firm stumped up $2 billion to snap up Oculus, the company famous for making a wrap-around virtual reality headset, the Rift.

That suggests that Zuckerberg has major plans to expand beyond what we think of today as social networking.

So, why virtual reality? Perhaps Zuckerberg imagines that the next generation of online social interaction will involve immersive virtual environments in cyberspace?

Never one to pass up a good opportunity to troll its adversaries, North Korea on Thursday responded to the stabbing of U.S. Ambassador Mark Lippert by celebrating it as a "knife attack of justice," and "just punishment for U.S. warmongers." The statement, from official North Korean news agency KCNA, also said the attack was a sign of "anti-U.S. sentiment" in South Korea — which is true, at least regarding the attacker, Kim Ki-Jong.

Lippert, an Asia policy expert who has only been ambassador to South Korea since October, received 80 stitches to his face and will probably stay in the hospital for up to four more days, CNN reports, citing a doctor at Yonsei Severance Hospital. The one-inch-deep gash on his face required two hours of surgery, but didn't sever any facial nerves.

Kim, the attacker, had been invited to the event, as he was a member of the organization that was hosting it, the Korea Council For Reconciliation and Cooperation. In 2010, Kim was reportedly arrested and given a suspended two-year sentence after trying to hit Japan's ambassador with a piece of concrete. The Associated Press shows the aftermath of Thursday's attack in the video below. —Peter Weber

On Thursday, Liberia plans to release its final Ebola patient from a Chinese-built hospital in Monrovia, the capital, according to Tolbert Nyenswah, the head of the country's Incidence Management System. The recovered patient is the last known case of Ebola in Liberia, and if no new cases emerge in the next 42 days, the country will be declared Ebola-free.

Almost 10,000 people have died since the world's worst Ebola outbreak started a year ago, and Liberia shouldered the highest number of deaths. Ebola cases are also down sharply in neighboring Guinea and Sierra Leone, although on Tuesday, Sierra Leone reported nine new cases within 24 hours.

Last year, Florida enacted a law banning doctors from asking their patients if they own a gun. Daily Show correspondent Jordan Klepper is on it. To understand (and, well, mock) the rationale for the "Docs vs. Glocks" law, Klepper interviewed Noel Flasterstein, a second amendment attorney, who argued that the bill could lead to "Holocaust 2" and downplayed the 3,000 annual gun deaths among 14- to 25-year-olds, a statistic he cited himself.

For the other side, Klepper talked with Dr. Toni Richards-Rowley, a pediatrician and "buzzkill." And as his icing on the cake, Klepper interviewed Marco Prisco, who owns a pool business — and welcomed pediatricians discussing pool safety with parents and kids. It gets a little intense, like when Klepper messes with Flasterstein over mental illness, so he ended the segment with a little comic relief, sporting a gunshot wound in a room full of doctors. Watch below. —Peter Weber

Hillary Clinton's use of a personal email account, not a government one, while Secretary of State is a real story, Jon Stewart said on Wednesday night's Daily Show, raising issues of archiving and accountability. Her aides shouldn't get to pick which emails to turn over to the State Department for the same reason "Doritos doesn't get to decide which ingredients consumers need to know about, or why you don't get to tell the cops which pockets to search."

But all anyone seems to care about is how this story will affect Clinton's presumed 2016 presidential ambitions. Stewart's guess? None. "What, do you think maybe wrong-email-address-ghazi will be a big boost to her Democratic primary rival, TBD?" he asked. And in the general election, Republicans "pretty much already believe her and her husband to be treasonous, murderous griftasaurases." If fact, he added, "personally, I think her email trouble helps sew up the senior vote — you know, they can relate." Well, it's a theory. —Peter Weber

Former heavyweight champ Mike Tyson has always been better at fighting than talking, so Jimmy Kimmel carried a lot of this interview from Wednesday night's Kimmel Live. Still, it's talking, or "shit-talking," on Madonna's new album that brought Tyson on the show, so Kimmel asked him if he'd ever met Madonna before flying out to record a track with her. "Yes, on a couple of occasions," Tyson replied. After a long pause, Kimmel got him to acknowledge that on none of those occasions had he ever "made love to Madonna."

The occasion Tyson talked about, though, was going to see Big Top Pee-Wee with Madonna in the 1980s, along with her then-husband Sean Penn and Tyson's significant other at the time (almost certainly Robin Givens). "That's the craziest double date I ever heard of," Kimmel said. Tyson said he and Penn "fell asleep" in the movie, Tyson acknowledged, but he meant no disrespect to the actor: "We love Pee-Wee, we're a big fan of Pee-Wee. But we were slightly inebriated." You could do that in the '80s, especially if you were Mike Tyson. —Peter Weber

China will budget about $145 billion for its military in 2015, a spokeswoman for the National People's Congress said on Wednesday. That's about a 10 percent increase, and it follows years of double-digit military spending hikes — and double-digit economic growth. And actual spending on the People's Liberation Army, especially its naval branch, will probably exceed the budgeted amount, The New York Times reports. Read the entire Times article, especially if you are interested in China's military, but for a brief look at how China's military spending stacks up to its rival world powers, BBC News has this short video. You'll get some big numbers, but the BBC also threw in as background some country-specific video of what each nations spends its military budget on. Watch below. —Peter Weber

If you've ever wanted to spend the night in Leonardo DiCaprio's house, now's your chance.

The actor is renting out the $5 million Palm Springs house he purchased about a year ago at the not-such-a-bargain price of $4,500 a night, with a two night minimum. The 7,022-square-foot modern masterpiece was designed by Donald Wexler in 1964 for Dinah Shore, and was remodeled before DiCaprio bought it. The house boasts six bedrooms, seven-and-a-half bathrooms, a pool, tennis courts, and a casita. While sadly the $4,500 a night fee doesn't include a visit from DiCaprio, it does provide daily maid service and WiFi.

There are some stipulations as to who can stay at the property, ABC Los Angeles reports. The house will not be rented out to fraternities, sororities, or any other organizations with members under the age of 25. You also can't play loud music, host big parties, smoke, or bring your pets...with those rules, it might just be better to stay home.

Parents, grandparents, teachers, and anyone else who has to deal with teenagers, listen up: Seth Meyers will accurately explain what "on fleek" means in the Late Night video below. But under no circumstances should you use any of the other teen slang words in the manner he explains. In fact, it's probably safer not to use any of them at all. Especially "twant." On the other hand, you should watch for the laughs. (Warning: Meyers at times uses slightly crude language you and your coworkers/children/parents will understand.) —Peter Weber

A New Jersey appellate court ruled on Wednesday that a man who was burned by a hot skillet while praying at an Applebee's cannot seek damages from the chain for his injuries.

Hiram Jimenez said that in March 2010, his waitress at the Westampton, New Jersey, Applebee's did not warn him that his steak fajita skillet was extremely hot, and when he bent over it in prayer, he heard sizzling noises and felt grease splatter in his left eye and on his face, NBC Los Angeles reports. Jimenez said he panicked, causing the food to fall into his lap and resulting in more burns. He does not have any scarring from the incident.

The appellate court upheld an earlier lower court ruling that dismissed the suit on the grounds that hot food posed an "open and obvious danger."

The details of Thursday morning's knife attack on U.S. Ambassador Mark Lippert at a breakfast lecture in Seoul are not 100 percent clear — an event organizer said that the assailant ran up to Lippert, screaming, as soup was being served, then began slashing; a reporter tells The New York Times that Lippert "was exchanging name cards when a man approached the ambassador and toppled him and attacked him in the face with a knife."

But the motives of the attacker, 55-year-old Kim Ki-Jong, seem pretty certain. As he was cutting Lippert on the face and wrist with a 10-inch blade, Kim reportedly yelled "South and North Korea should be reunified," and after the attack he told reporters that he was angry about ongoing joint U.S.-South Korea military exercises. North Korea calls the annual exercises a provocation each year, and fires missiles in protest; anti-U.S. activists in South Korea protest the military drills, too.

Lippert is in stable condition, and the wounds aren't life-threatening, according to the State Department, which strongly condemned the attacks. President Obama also called Lippert, a former national security adviser, at the hospital to wish him a speedy recovery. South Korean President Park Geun-hye, on tour in the Middle East, called the incident "not only a physical attack on the U.S. ambassador in South Korea but also an attack on the Korea-U.S. alliance and we will not tolerate it."

Lippert, 42, is a decorated Navy veteran and expert on Asia policy, and has been ambassador since last October.