The Caucus: Hacked A.P. Twitter Feed Jars Markets

The Twitter account for The Associated Press was hacked on Tuesday and erroneously sent out a tweet saying there had been explosions at the White House, injuring President Obama.

    

Twitter and Starcom Sign Advertising Deal

The deal with Starcom MediaVest Group, one of the largest agencies in the world, will offer advertisers tighter coordination of online and television marketing.

    

Comedy Central to Host Comedy Festival on Twitter

Comedy Central will use Twitter to host a comedy festival. The partnership between the two companies represents the evolving relationship between television and social media.

    

Brown University Student Mistaken for Bombing Suspect

A missing Brown University philosophy student was mistakenly thought to be one of the men sought in the Boston Marathon bombings.

    

New Twitter Service Hopes to Capture Musical Trends

Twitter’s idea is to recommend songs based on personal contacts as well as on what is popular among the 200 million Twitter audience.

    

Online Furor Draws Press to Abortion Doctor’s Trial

Following accusations that the case was being ignored by the national news media, reporters descended Monday on Philadelphia, where Dr. Kermit Gosnell was on trial.

    

Clues Emerge About Twitter’s Music Feature

The service’s music feature is still hidden from the public, but it appears to be a way to learn what music is becoming popular.

    

Tumblr to End Storyboard

The popular social blogging site said that it would shut the multimedia news blog that it had created to report on its own community and dismiss a skeletal staff of three.

    

Media Decoder Blog: Facebook’s Play for the Smartphone Screen

The company hopes to weave itself seamlessly into the mobile world.

Advertising: Social Marketing Drives a New York Renaissance

Marketers are being drawn to digital realms like social media, in which agencies in New York — home to Silicon Alley as well as Madison Avenue — are increasingly proficient.

Amazon to Buy Goodreads

Amazon’s purchase of Goodreads, a social media site built around sharing books, would give the online bookseller more power in determining which authors get exposure.

Advertising: McCann Always On Gets a Name and Expands Agency’s Social Media Unit

A division of McCann Erickson New York that specializes in social media will grow to 30 employees, and will stress interactions with consumers.

Nick D’Aloisio, 17, Sells Summly App to Yahoo

Nick D’Aloisio, a programming whiz who wasn’t even born when Yahoo was founded in 1994, sold his news-reading app, Summly, to Yahoo.

Advertising: Ads That Speak the Language of Social Media

The new starring role of social media in ads signals that agencies and advertisers believe they are prevalent enough to refer to without the risk of being misunderstood.

Media Decoder Blog: At The New Republic, Even Firings Enter the Digital Age

Timothy Noah, an editor at the magazine, tweeted out that he had been fired.

Media Decoder Blog: Site Brings New Way to Connect With Vergara and Other Latino Stars

The Web site, called NuevoWorld, was created by Luis Balaguer, Ms. Vergara’s business partner and the co-founder of Latin World Entertainment.

Outcry Over Computer-Crime Indictment of Matthew Keys

The indictment of Matthew Keys, 26, in relation to a 2010 incident of online vandalism has led to an outcry over sentencing in computer crimes.

Media Decoder Blog: Fandango Creates a Movie Buzz Index

Fanticipation, from Fandango, the online seller of movie tickets, will rank upcoming releases based on a formula that includes social media data and advance ticket sales

NPR’s Generation Listen Seeks Audiences in Their 20s

With Generation Listen, NPR, like other old-media companies, is working to build connections to a younger audience.

Campaign Spotlight: Celebrities Help Unicef Turn On ‘Taps’ for Clean Water

The Unicef Tap Project intensifies its use of social media to promote fund-raising for clean drinking water for children worldwide.