A US lawmaker asks Facebook to wait before launching its digital currency, hours after it was announced.

There are slightly fewer Chinese machines, and some more US ones, in the list of top supercomputers.

The game – considered appealing to under 18s – gave players the chance to earn “gems” by viewing ads.

Social media companies know approval can be addictive, so how should we manage the compulsion to be liked?

The ads were displayed to the young user despite Instagram’s policies saying some should not be shown to her.

Russia has countered attempts to hack into its infrastructure, says Kremlin spokesman.