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The platforms promoted the name of a man falsely accused of being the shooter by surfacing less-credible sites. The companies say they're working on fixes, but analysts say the challenge is massive.

Interested in hearing more from Donald Trump or Hillary Clinton, but a little hesitant to declare to your friends that you "like" them?

In September, a Facebook "bug" allowed developers to access images people shared with friends on Facebook Stories — or images users had not even posted. Up to 6.8 million users may have been affected.

Dave and Charlotte Willner started a fundraiser to raise $1,500 for the nonprofit RAICES. They've now raised close to $20 million. Michel Martin asks them about how they far exceeded their original goal.

Also: It's the 70th anniversary of the liberation of the Auschwitz concentration camp; the Senate blocks a Keystone XL pipeline bill; and Facebook and other social media sites are briefly down.

Weekend Edition Sunday Host Rachel Martin speaks with NPR's Scott Horsley as President Obama departs for the G8 Summit in Northern Ireland.

A Facebook message, distributed during the 2010 United States congressional elections, influenced the voting behavior of millions of recipients and their friends. New research in the journal Nature highlights the potential of online social networks for shaping real-world behavior on a massive scale. Melissa Block talks to Shankar Vedantam.

He will answer to Senate and House committees on the company's failure to protect users' personal data.

CEO Jack Dorsey announced that Twitter will stop running political ads, citing online ads' "significant risks to politics." Facebook has been criticized for allowing deceptive political ads.

The latest revelations gleaned from documents leaked by National Security Agency contractor Edward Snowden show that the spy agency gathers tens of thousands of such records each day.