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Twitter goes public at $45 a share

Actor Patrick Stewart rings opening bell, as Twitter tweets '#Ring!'

Facebook expands in Europe as it scoops up new employees

Star architect Frank Gehry is designing new Dublin and London offices for the social media company

New bug bounty program rewards researchers for finding flaws in widely used software

Microsoft and Facebook team up to reward vulnerability research that can affect a lot of Internet users

With IPO cash influx, Twitter could be bigger threat to Facebook

Twitter expected to raise initial share price again, just ahead of Thursday IPO

Facebook Releases Query Engine to Open Source Community

Instagram wants to use photos to keep people informed about world events

Instagram sees its service becoming more Twitter-like in the future

Facebook goes open source with query engine for big data

Facebook's Presto can sift through petabytes of data and swiftly return query results, according to the company

Take that, Facebook! Twitter’s news junkies are younger, more educated

Just ahead of IPO, study also shows Twitter users more apt to use mobile devices

Is Twitter emulating Facebook with pre-IPO price bump?

Twitter ups its share price, making some analysts nervous about its IPO

Social Media Policy Offers Dos and Don’ts for Employees