What a week. U.S. President Barack Obama's "Four More Years" photo — released just after he was re-elected Tuesday night — became the most-shared photo in Twitter's history. Other top photos this week ... well, they were all from Justin Bieber and One Direction.

Our friends over at Skylines went through 34,458,200 unique pictures and compiled the ones that were most shared and retweeted. Read more…

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The creation of a Hollywood movie started with a question on Reddit: Could a modern U.S. Marine infantry battalion destroy the entire Roman Empire during the reign of Augustus?

The head-scratcher of a query, posted to the site in 2011, amassed nearly 4,000 comments and got military historian James Erwin thinking about the answer. Erwin was so intrigued that he sat down during his lunch break and wrote a short story based on the question. By end of day, Erwin had 250,000 visitors reading his blog post "Rome, Sweet Rome." Read more…

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Facebook announced a new method of mobile messaging Thursday: A system where users can send and receive messages within other apps as to not disrupt their general workflow.

The name of this visionary technology? Chat heads.

(Pause for reaction.)

Of course, the Twitterverse instantly went to work questioning Mark Zuckerberg's sanity for approving the odd name. Read more…

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LAS VEGAS — Would you wear a headphone hairband with an attachable hat that looks like you walked out of the Kentucky Derby? What about a pair with spikes or bright pink feathers?

Monster, formerly known as Monster Cable, was at the 2013 International CES show on Monday and showcased some quirky clip-on accessories that can be added to headphones.

"I wanted to create something with inspiration that wasn't just the normal," Monster CEO Noel Lee told Mashable. "A lot of people change colors and fabrics, and we do that too, but we wanted to do something that stands out and makes a statement." Read more…

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