Scientists have long grappled with how to measure the effect of social media on children. Now, the UK government has announced a total ban for everyone under 16, and researchers are rushing to design rigorous studies before it comes into effect

The U.K. seems to be following Australia's lead in banning a wide swath of social media for teens.

The British government has announced a total, nationwide ban on social media access for children under the age of 16.

There may even be a online curfew for under-18s too.