Sheryl Sandberg sells $90m of Facebook stock

Facebook's second in command sells 2.4m shares amid growing optimism social networking site is getting to grips with selling adverts on smartphones and tablets

Twitter explains how Ryan Gosling, Chris Hadfield and Dove went viral

Social network shows off visualisations of viral videos while warning brands and agencies that 'there are no rules to virality'. By Stuart Dredge

Why the internet needs a more selective memory

The web was supposed to free our minds: instead, it has loaded us down with timeline trivia. No wonder self-destructing communication services have sprung up, writes Jemima Kiss

Porn filters: 12 reasons why they won’t work (and 3 reasons why they might)

David Cameron wants to block access to pornography unless people opt in, but is it possible to filter only the things you want?

Brands should beware of Instagram’s new video importing feature

Ability to upload videos from iPhone and Android smartphones' libraries should not be seen as an excuse for creative laziness. By Stuart Dredge

Move to mobiles and share rebound leaves Facebook sitting pretty

Shares have soared along with revenue as Facebook users accepted its new model for mobile advertising. It's a remarkable turnaround, says Charles Arthur

How low-paid workers at ‘click farms’ create appearance of online popularity

Investigation finds fake Facebook 'likes' and Twitter followers could be misleading consumers

VK: the ‘Russian Facebook’ that has offered Edward Snowden a job

A look at the organisation that wants the NSA whistleblower to work on its security arrangements

Facebook plans to woo big budget brands with 15-second video ads

Social media site may charge as much as $2.5m a day for companies to advertise through on users' homepages. By Mark Sweney

DriveClub, PlayStation 4 and the future of social gaming

Keith Stuart: How Evolution Studios is planning to shake up the whole concept of online multiplayer with its incoming PS4 racer

Zynga sues Bang With Friends ‘casual sex’ app for trademark infringement

Words With Friends good but one-night stands with them bad for social games publisher's brands, claims court filing. By Stuart Dredge

Facebook mobile games publishing scheme competes with Zynga and Rovio

Social network promising indie developers it will 'take their mobile games global' to its 800m mobile users. By Stuart Dredge

Twitter chiefs to face MP committee over abusive threats to women

Cross-party group to quiz Twitter executives over complaints that they have failed to protect women from online abuse

Porn sites get more internet traffic in UK than social networks or shopping

8.5% of clicks in June were on legal pornography sites, according to figures released as David Cameron attempts crackdown

More than 80% of children lie about their age to use sites like Facebook

Youngsters see inappropriate content because social media sites too lax on self-declaration, says ASA. By Mark Sweney