The days of a generic message broadcast to the mass market are nearing an end, says Quirk.
Twitter is doing just fine as a private company and has no plans to go public, says CEO Dick Costolo.
Treading the thin line between useful and creepy, Facebook rolls out read receipts to its groups - showing exactly who's ignoring what.
As General Motors enters talks with the social network about returning as an advertiser, Facebook also explores new revenue streams.
The micro-blogging service reveals government requests for user information and takedown notices received in the last six months.
The platform helps companies improve collaboration, communication, innovation and operational efficiency
The social network subtly rolls out an update that automatically changes the e-mail address displayed on users' timelines.
The enterprise social networking service will be integrated into Microsoft's Office portfolio, while also remaining a standalone service.
The social network's new mobile feature uses location services to suggest new Facebook friends.
The micro-blogging site was inaccessible for hours on Thursday, and hackers have tried to claim responsibility.
Facebook users can now finally go back and edit stupid comments and embarrassing spelling mistakes.
The Rio+Social online event brings together industry leaders and civil society to find solutions for a sustainable future.