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June 30, 2014
CC by: Dimitris Kalogeropoylos

On Sunday, Facebook sort of apologized for manipulating the news feeds of 689,003 randomly selected users, all for the purpose of science. For a week in January 2012, Facebook researchers secretly funneled either more positive or negative stories into the selected news feeds, then watched to see how the users reacted in their own posts.

The results, published in the journal Proceedings of the National Academy of Sciences earlier this month, are actually pretty interesting: Moods are contagious, even over social networks. Or as the researchers put it:

When positive expressions were reduced, people produced fewer positive posts and more negative posts; when negative expressions were reduced, the opposite pattern occurred. These results indicated that emotions expressed by others on Facebook influence our own emotions, constituting experimental evidence for massive-scale contagion via social networks. [PNAS]

If the findings are interesting, the methodology is pretty controversial. Facebook argues that it has the right to do this under that terms of service agreement you didn't read when you signed up, but academic social scientists are supposed to get "informed consent" from the subjects. There was also some more gut-level revulsion at the idea of Facebook manipulating people's feelings — here's privacy activist Lauren Weinstein:

After the PNAS study began to get noticed, Adam Kramer, the Facebook employee who conducted it with two researchers from Cornell and UC San Francisco, tried to explain himself on (where else?) Facebook:

We felt that it was important to investigate the common worry that seeing friends post positive content leads to people feeling negative or left out. At the same time, we were concerned that exposure to friends' negativity might lead people to avoid visiting Facebook.... My coauthors and I are very sorry for the way the paper described the research and any anxiety it caused. [Facebook]

The world's largest social network has long shaped what its users see: When you log in, Facebook shows you about 300 of the 1,500 items that might show up on your news feed, determined by a closely guarded algorithm. "Facebook didn't do anything illegal, but they didn't do right by their customers," Gartner analyst Brian Blau tells The New York Times. Caveat emptor. Peter Weber

7:54 p.m. ET

An explosion at a bar in Ansbach, Germany, late Sunday killed one person and injured 11 others, police said.

The mayor of Ansbach, a city near Nuremberg, told reporters an explosive device was used, the BBC reports, and a spokesman for the Bavarian Interior Ministry said the explosion appeared to be intentional. The area around Eugene's Wine Bar has been sealed off by police, German media reports, and Interior Minister Joachim Herrmann is on his way to the area. Last week, a gunman opened fire in Munich, killing nine, and an ax-wielding attacker injured several people on a train in Wuerzburg. Catherine Garcia

4:32 p.m. ET
Andrew Burton/Getty Images

Democratic National Committee Chairwoman Debbie Wasserman Schultz announced on Sunday that she will step down after leaked emails seem to show the committee's bias against Sen. Bernie Sanders. In one email, the DNC's chief financial officer, Brad Marshall, suggested attacking Sanders for his religious beliefs and painting him as an atheist. Marshall apologized on Saturday, but on Sunday, Sanders said the emails were "outrageous" and called for Wasserman Schultz to resign. "I mean there's no question to my mind and I think no question to any objective observer's mind that the DNC was supporting Hillary Clinton, and was at opposition to our campaign," Sanders said.

The leaked emails, and the resignation, come one day before the start of the Democratic National Convention and at a time when the Democratic Party is showing signs of division after a tense primary season between Sanders and Clinton. Wasserman Schultz will step down at the end of the convention. In a statement following the announcement, Clinton called Wasserman Schultz a "fighter" and thanked her for her service. Jessica Hullinger

2:58 p.m. ET
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In a surprising move, Michael Bloomberg, a billionaire media executive and the former mayor of New York City, will endorse Hillary Clinton for president, The New York Times reports. Bloomberg left the Democratic Party in 2000 to become a registered Republican. Earlier this year, he was considering his own presidential run as an independent. While Bloomberg disagrees with Clinton on a variety of subjects, including gun control and immigration, the Times reports he is dismayed at the thought of a Donald Trump presidency, and believes Clinton to be a "far better choice," said Howard Wolfson, a Bloomberg adviser.

On Wednesday, Bloomberg will make his case for Clinton on stage at the Democratic National Convention, alongside other convention headliners like President Barack Obama, and Clinton's VP pick, Sen. Tim Kaine (D-Va.). The hope, it seems, is that Bloomberg's endorsement will speak to undecided moderates. "As the nation's leading independent and a pragmatic business leader, Mike has supported candidates from both sides of the aisle," Wolfson told the Times. Jessica Hullinger

2:28 p.m. ET
JEFF PACHOUD/AFP/Getty Images

Chris Froome won the Tour de France on Sunday, becoming the first Briton to win the race three times. After 89 hours, six minutes, and one second in the saddle over the race's 21 stages, Froome, 31, crossed the finish line in Paris almost three minutes before his closest rival. He won in 2015 and in 2013, and is only the eighth man with three Tours under his belt. Jessica Hullinger

10:39 a.m. ET
NATALIA KOLESNIKOVA/AFP/Getty Images

The International Olympic Committee said Sunday that it will not completely ban Russia from competing at the Rio Olympics, Reuters reports. Instead, the IOC is putting the responsibility of deciding who can compete in the Games on the bodies that govern the individual sports.

The announcement comes after an independent report found evidence of widespread state-sponsored doping among Russian Olympic athletes. Competitors will need to meet a set of criteria to demonstrate they are clean, and anyone who has previously been caught doping will not be allowed to compete. Jessica Hullinger

9:09 a.m. ET
Johannes Simon/Getty Images

German authorities say the gunman who opened fire at a Munich shopping center on Friday, killing 9 people and injuring 35 more, planned the attack for a year. On Sunday, Robert Heimberger, president of the Bavarian state criminal police office, said 18-year-old David Sonboly left a manifesto on his computer. "He appears to have planned this act since last summer," Heimberger said. "He completely occupied himself with this act of rampage."

In planning his attack, Sonboly, who authorities say was "obsessed" with mass shootings, visited the site of a previous school shooting and took pictures, The Associated Press reports. In 2015, Sonboly spent two months as an inpatient at a mental care facility, where he was treated for depression and a fear of contact with other people. He killed himself after the attack. Jessica Hullinger

7:49 a.m. ET

On Sunday morning, Donald Trump, or whoever was running his Twitter feed, went on a rampage against Hillary Clinton's decision to pick Sen. Tim Kaine (D-Va.) as her vice presidential nominee. Embedded amongst a flurry of exclamation points and all-caps accusations of "BAD JUDGMENT" was an error that's sure to needle grammar snobs: Where Trump should have used "their," he used "there" instead. And in the same breath — er, keystroke — instead of "waste," he used "waist."

Cringe!

Then again, what more do we expect from a presidential candidate who researchers say has the grammatical sophistication of an 11-year-old?

Update at 8:20 a.m.: The above tweet has been deleted and replaced with a corrected version. Jessica Hullinger

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